MONARCH INSTRUMENT ACT-3X User manual

ACT-3X
Tachometer / Totalizer / Ratemeter
User Manual and Reference Guide
MONARCH INSTRUMENT
15 Columbia Drive Amherst, NH 03031 USA
Phone: [phone] Fax: [phone]
E-mail: [e-mail]
Website: www.monarchinstrument.com

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Safeguards and Precautions
1. Read and follow all instructions in this manual carefully, and retain this manual for future
reference.
2. Do not use this instrument in any manner inconsistent with these operating instructions or
under any conditions that exceed the environmental specifications stated.
3. Be sure the power supplied to this instrument matches the specification indicated on the rear
panel of the instrument
4. Be sure all power is removed before making or removing any connections to or from this
instrument.
5. There are no user serviceable parts in this instrument. Refer service to a qualified technician.
6. Do not allow cables extending from unit to come into contact with rotating machinery, as
serious damage to the equipment, or severe personal injury or death may occur as a result
7. This instrument may not be safe for use in certain hazardous environments, and serious
personal injury or death could occur as a result of improper use. Please refer to your facility’s
safety program for proper precautions.
In order to comply with EU Directive 2012/19/EU on Waste Electrical and Electronic
Equipment (WEEE): This product may contain material which could be hazardous to human
health and the environment. DO NOT DISPOSE of this product as unsorted municipal waste.
This product needs to be RECYCLED in accordance with local regulations, contact your local
authorities for more information. This product may be returnable to your distributor for
recycling - contact the distributor for details.
Monarch Instrument’s Limited Warranty applies.
See www.monarchinstrument.com for details.
Warranty Registration and Extended Warranty coverage available online at
www.monarchinstrument.com.
Rev 1.2, June 2019

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T
TA AB BL LE E O OF F C CO ON NT TE EN NT TS S
1.0 GENERAL OVERVIEW..............................................................................1
2.0 INSTALLATION .........................................................................................1
2.1 Noisy Environments ......................................................................................................... 1
2.2 Adjustments ...................................................................................................................... 2
2.3 Connections ...................................................................................................................... 2
2.3.1 Power Connections.............................................................................................. 2
2.3.2 Sensor Connections ............................................................................................ 2
2.3.3 Analog Output ...................................................................................................... 3
2.3.4 Auxiliary Input (AUX- Channel 2)........................................................................ 3
2.3.5 Pulse Output......................................................................................................... 3
2.3.6 Alarm Relay Outputs............................................................................................ 3
2.3.7 Serial Communications ....................................................................................... 4
3.0 FRONT PANEL ..........................................................................................4
3.1 Status LED’s ...................................................................................................................... 4
3.1.1 LIM 1 and LIM 2 (Alarm) LED’s ........................................................................... 4
3.1.2 GATE LED ............................................................................................................. 4
3.1.3 MAX and MIN LEDS.............................................................................................. 4
3.1.4 RPM LED ............................................................................................................... 4
3.2 Push Buttons..................................................................................................................... 4
3.2.1 SET BUTTON ........................................................................................................ 4
3.2.2 RESET BUTTON ................................................................................................... 4
3.2.3 UP () and DOWN () BUTTONS......................................................................... 5
3.2.4 RECALL BUTTON................................................................................................. 5
4.0 OPERATION ..............................................................................................5
4.1 Modes of Operation –Channel 1 ..................................................................................... 5
4.1.1 RPM Mode............................................................................................................. 5
4.1.2 Frequency Mode................................................................................................... 5
4.1.3 Scale Mode (Ratemeter) ...................................................................................... 5
4.1.4 Single Event Capture (SECAP) Mode................................................................. 5
4.1.5 Rate of Change (ROC) Mode............................................................................... 5
4.1.6 Totalizing Mode .................................................................................................... 6
4.2 Modes of Operation –Channel 2 ..................................................................................... 6
4.2.1 Off .......................................................................................................................... 6
4.2.2 Inhibit .................................................................................................................... 6
4.2.3 Single Event Capture ........................................................................................... 6
4.2.4 External Reset –Input Totalizer ......................................................................... 6
4.2.5 External Reset –Alarms...................................................................................... 6
4.3 Decimal Point .................................................................................................................... 6
4.4 Alarm Limits ...................................................................................................................... 6
4.4.1 Latching vs. Non-Latching Limits ...................................................................... 7
4.4.2 Dead band (Hysteresis) ....................................................................................... 7
4.4.3 Low Limit Lockout ............................................................................................... 7
4.4.4 Fail Safe ................................................................................................................ 7
4.5 Analog (AO) and Current (IO) Output.............................................................................. 7
4.6 Maximum and Minimum ................................................................................................... 7
4.7 Throughput ........................................................................................................................ 8
4.7.1 Display Update Rate ............................................................................................ 8
4.7.2 Internal Update Rate - GATE............................................................................... 8
4.7.3 Low End ................................................................................................................ 8

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4.8 PULSE OUTPUT ................................................................................................................ 8
5.0 USING THE MENU ....................................................................................8
5.1 ..................................................................................................................................... 9
5.1.1 ........................................................................................................................ 9
5.1.2 ...................................................................................................................... 9
5.1.3 ...................................................................................................................... 9
5.1.4 ...................................................................................................................... 9
5.1.5 ...................................................................................................................... 10
5.2 ................................................................................................................................... 10
5.2.1 ...................................................................................................................... 10
5.2.2 .................................................................................................................... 10
5.3  ............................................................................................................................... 10
5.4 ................................................................................................................................. 10
5.4.1 .................................................................................................................... 10
5.4.2 .................................................................................................................... 10
5.4.3 ........................................................................................................................ 10
5.4.4 .................................................................................................................... 11
5.4.5 .................................................................................................................... 11
5.4.6 .................................................................................................................... 11
5.5 ................................................................................................................................. 11
5.6 ................................................................................................................................. 11
5.6.1 .................................................................................................................... 11
5.6.2 .................................................................................................................... 11
5.6.3 ...................................................................................................................... 11
5.7 ................................................................................................................................... 11
5.8 ................................................................................................................................... 11
5.9  ............................................................................................................................... 11
5.10  ................................................................................................................................. 11
5.11 ................................................................................................................................. 12
5.12 ................................................................................................................................. 12
6.0 SERIAL OUTPUT.....................................................................................12
6.1 Data from the Serial Interface ........................................................................................ 12
6.2 Serial Commands............................................................................................................ 12
6.2.1 Run Mode Commands ....................................................................................... 12
6.2.2 Control Commands............................................................................................ 13
7.0 SPECIFICATIONS ...................................................................................14
8.0 OPTIONS AND ACCESSORIES / SENSORS .........................................15
APPENDIX A –SCALING THE ACT FOR ENGINEERING DISPLAYS ............16
APPENDIX B –USEFUL CONVERSIONS.........................................................17
APPENDIX C –USING THE SINGLE EVENT CAPTURE MODE......................18
APPENDIX D –SETTING UP THE ETHERNET INTERFACE ...........................19
APPENDIX E –MENU OVERVIEW....................................................................20

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1.0 GENERAL OVERVIEW
The ACT-3X digital panel meter is an extremely versatile instrument. The user has complete control of the unit configuration.
Power may be either 115 - 230 Vac (50/60 Hz), or optionally, 12 Vdc or 24 Vdc. Input signals are accepted (on Channel 1) from
optical, proximity, magnetic, infrared or laser sensors, or direct TTL or external AC sources. A second AUXiliary input
(Channel 2) may be used for instrument control and remote resetting. There are several remote communication options –RS232,
USB or Ethernet and the optional remote software can be used to program the unit or display data locally. The unit is suitable for
panel mounting or bench top use, with convenient screw terminal connections on the rear panel of the instrument.
When the instrument is turned on, it displays all 8s, then ―3 rx.x‖, where 3 is the unit type (ACT3) and rx.x is the software
revision level, before entering the normal mode of operation.
The display will show ―- - - - -‖ when a measurement is over range.
2.0 INSTALLATION
The instrument is intended to operate in the following environment: Indoor Use Only
Installation Category II per IEC 664 Pollution Degree Level II per IEC61010-1
Measurement Category I per IEC61010-1 Altitude up to 2,000 m
Temperature -10 °C to +50 °C operating per IEC61010-1
Humidity Maximum relative humidity 80% for temperatures up to 31°C decreasing linearly to 50%
relative humidity at 40°C
AC Mains Supply 100 - 240 Vac ~ +10% 50/60 Hz 8 VA
DC Supply (Option) 12 or 24 VDC+10% 6 watts (DC Option)
NOTE: The instrument is designed to be panel mounted and as such should be considered as fixed
equipment or permanently connected. If permanently connected, disconnection from the supply
must be possible via a customer supplied switch or circuit breaker rated at 120V or 240V
(dependent on local voltage supply) 5A minimum when connected to an AC supply or 30V 1A
minimum when connected to a DC supply. This disconnection device must disconnect all current-
carrying conductors. It must be included in the panel installation and should be clearly marked, in
close proximity to the Unit and easily accessible to the operator.
The ACT3X is a 1/8 DIN enclosure requiring a 3.58‖ wide by 1.74‖ high (91x44 mm) mounting hole. Approximately 5‖ (127
mm) will be required behind the panel. Refer to Figure 1 below.
Before installing, check the power
supply requirements on the rear
panel. Remove the mounting clips,
if fitted, and install the unit into the
panel from the front. From the rear
of the unit, install the mounting
clips into the slots on each side of
the unit and tighten the mounting
screws against the front panel.
WARNING: Do not over
tighten the mounting screws.
Figure 1 Dimensions in Inches [Millimeters]
WARNING: Do not use this instrument in any manner inconsistent with these
operating instructions or under any conditions that exceed the
environmental specifications stated.
2.1 Noisy Environments
These instruments are highly responsive. They have input ranges up to 999,990 RPM and 250,000 Hz. They therefore have
extremely fast input circuitry that may respond to spurious noise. It is important to provide a clean source of power to the
units, either AC or DC, and to ensure that the input to the unit is free of spikes or any other high frequency noise. In noisy
environments, it may be necessary to supply power through a filter, or alternate source. The inputs may also need to be

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damped, to suppress high frequency noise. It is always a good idea to use shielded cable for input signals and ensure the
shield is properly grounded.
NOTE: The common on the inputs is NOTa ground.
Another source of noise is spikes generated by the alarm relay contacts. It may be necessary to suppress the contacts
externally. This is particularly true when the internal relays switch other external relays that do not have spike suppression.
Always ensure that all sources of spikes or noise are adequately suppressed from the environment.
2.2 Adjustments
Since the instruments are crystal controlled, there are no user calibration adjustments. Any of the programmable parameters,
such as scaling, limits, analog out, and so on must be set up using the menu options.
2.3 Connections
All connections are via the rear panel of the instrument –power, sensors, alarms, analog output, and communication. The
rear panel is shown below and may vary slightly depending on what options are in the unit.
Figure 2 ACT-3X Rear panel with Analog Output and USB Option
2.3.1 Power Connections
Power to the unit is connected to the terminals under the sections labeled POWER on the rear panel. Be sure the
power supplied matches the specification indicated on the rear panel. Refer to Figure 2 above.
If the unit is ac powered (115 - 230 Vac), connect the Live (Hot) wire to the terminal marked L and the Neutral
(Return) wire to the terminal marked N. NOTE: The ground connection is not required as the unit is fully isolated
from the mains.
If the unit is dc powered, connect the dc supply Positive to the terminal marked ―+‖ and the dc supply Negative or
Common to the terminal marked ―-‖. CAUTION: Ensure the dc voltage does not exceed the rating on the unit (12V
±10% or 24V ±10% as marked).
2.3.2 Sensor Connections
A speed sensor (not included) can be connected to the terminals under the section labeled IN on the rear panel. Refer
to Figures 2and 3.
Connections and their functions are as follows:
+V(A) Positive Supply Output. Used to provide power to optical, laser, infrared or amplified magnetic sensors.
Voltage out is +24Vdc, +12Vdc or +5Vdc (factory selected). Maximum load is 30mA from the 24V supply
or 60mA from the 5 or 12V supplies.
PX+ This output is for use with two wire proximity sensors. It has internal current sensing. Maximum load for
proper operation with two wire sensors is 20 mA.
SIG Signal Input. Positive input signal from the speed sensor. Accepts TTL pulses or ac signals, unipolar and
bipolar, from 1.1 Vac to 50 Vac. Connect the signal wire from three wire sensors or the positive side of two
wire magnetic sensors to this terminal. Typical input impedance is 10 Kohms.
COM Common or Negative Terminal. Common or Negative connection for both signal and power.
Refer to Figure 3 on the following page for connection of Monarch standard sensors. The connections are typical for
these types of sensors.

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Figure 3 Sensor Connections
2.3.3 Analog Output
The Analog Output is an option. The Output option is marked on the back of the unit to the right of the connector –
refer to Figure 2.
2.3.3.1 Current Output
The current output is 4 to 20 mA. This output is a current source and has a 12 Volt
dc internal compliance voltage. (Optional 24 Vdc may be ordered).
Typical connection is as follows: (See Figure 4.)
Connect the Positive side of the load to the OUT terminal marked ―+‖ and the other
side of the load to the terminal marked ―-―. With the internal 12 Vdc compliance
voltage the maximum load for the current loop is 500 Ohms. If the optional 24 Vdc
compliance option is ordered the maximum load will be 1000 Ohms.
2.3.3.2 Voltage Output
The analog output is 0 to 5 Vdc @ 5mA.
Connect the Positive side of the load to the OUT terminal marked ―+‖ and the return
side of the load to the terminal marked ―-‖. (See Figure 4.)
The output full scale and zero scale values are programmed via the front panel or remotely through the communication
port.
2.3.4 Auxiliary Input (AUX- Channel 2)
The Auxiliary Input is also referred to as Channel 2 (CH-2) and will accept a TTL input or any signal up
to 12Vdc. It has a weak pull up internally and can be used with a set of potential free contacts. The AUX
input is programmed via the front panel or remotely via the communication port. Refer to Figure 2 and
figure shown right –the AUX input is connected to the input marked AUX (+) and COM (-).
2.3.5 Pulse Output
The Pulse Output provides a pulse out for each pulse in. It is a TTL pulse switching between +5V and
ground. Refer to Figure 2 and figure shown right - the connection is to the PO (+) terminal and the COM
(-) terminal.
2.3.6 Alarm Relay Outputs
The Alarm Relay Outputs are potential free Form C contacts (Change Over) capable of
carrying 1A at 250Vac or 30Vdc.
The contacts are marked NCx where NC is the Normally Closed Contact, x = 1 or 2
depending on which relay you are using. CM is the Common and NO is the Normally Open Contact.
CAUTION: Relay contacts may be wired to external high voltage potentials –ensure all power to the contacts is off
before attempting any wiring.
CAUTION: During programming of the device, relay contacts may make or drop out intermittently.
Figure 4 Analog
Output Connections
+ OUT -
NOTE: Sensor shields may be attached to
input common (COM) if a ground point is
not available.

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2.3.7 Serial Communications
There are three serial communication options –Ethernet, USB and RS232. The Ethernet option will have a standard
RJ45 connector, the USB option will have a type B female connector, and the RS232 option will have a male DB9
connector on the rear panel. The connections of the Ethernet and USB are generic. For information on setting up the
Ethernet Interface refer to Appendix D. The connection of the RS232 DB9 is shown here:
Pin Description Direction
2 Receive data In
3 Transmit Data Out
5 Common (GND)
7 Request to Send RTS Out
8 Clear to Send CTS In
All other pins are not used. Communications are at the preset Baud Rate, 8 bits, No Parity and 1 stop bit.
3.0 FRONT PANEL
Refer to the first page for a photo of the front panel.
The front panel of the instrument has 5 push buttons, five 0.56‖ 7 segment light emitting displays, and six single light emitting
diodes (LED’s), marked LIM 1, LIM 2, GATE, MIN, MAX and RPM. Some of these LED’s may not be visible; it depends on
the mode the unit is in.
3.1 Status LED’s
3.1.1 LIM 1 and LIM 2 (Alarm) LED’s
The LIM 1 and LIM 2 (Alarm) LED’s indicate the status of the limits, particularly of the alarm output relay. When an
alarm trips, the corresponding LED blinks at a rate around 1 flash per second. When the alarm resets, the LED goes
out. These LED’s also go on continuously to indicate when and which limit is being set or adjusted. If the LED’s are
on continuously, the value on the display is a set point value, not the input value.
3.1.2 GATE LED
The GATE LED is an indication of the instrument’s input trigger signal from a sensor. It is triggered on by the falling
edge of an input pulse, and goes off about 150 milliseconds later (unless there is another input pulse). It is more useful
at slow speeds, as it appears to be on continuously at higher inputs. It gives an indication that a valid input trigger
signal is present.
3.1.3 MAX and MIN LEDS
The MAX and MIN LED’s indicate to the user that a maximum or a minimum is being displayed. If either one of
these LED’s is on, the display is a stored value, not the input value.
3.1.4 RPM LED
The RPM LED indicates that the RPM Mode (frequency x 60) has been selected, which can only be used when the
input is one pulse per revolution. The RPM LED is off in all other modes. In the Scale Mode the read outs may be in
RPM, but the RPM LED will be off.
NOTE: For applications where there is more than one pulse per revolution, the Scale Mode must be used.
3.2 Push Buttons
The five push buttons on the front panel have multiple functions. The following sections cover the function of the buttons
under normal operating conditions.
3.2.1 SET BUTTON
The SET button enters the Menu and allows the user to view the current settings in the unit. Refer to Section 5.0.
3.2.2 RESET BUTTON
The RESET button, when pressed, resets the Alarms, assuming they have tripped. It is the only way to reset a latching
alarm other than via the serial interface.
NOTE: If an alarm set point is exceeded when the reset button is pressed, the alarm will immediately trip again on
the next data acquisition cycle.
If the user holds the RECALL button and then presses the RESET button, the minimum and maximum values (and the
TOTAL if the unit is in the Totalizing mode) are reset.
In the Single Event Capture (SECAP) Mode, pressing the RESET button signals the instrument to take a reading at the
next trigger as well as its normal functions.
When in the Menu, the RESET button reverts back one level without saving any changes () or exits the Menu
(). However, when entering data values in the menu such as scale factor, set point, Ethernet settings or passcode,

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the RESET button changes the digit being edited (blinking digit). Also when entering a data value, holding down the
RESET button and pressing the DOWN ()button will move the decimal place.
3.2.3 UP () and DOWN () BUTTONS
The UP  and DOWN  buttons can be used to view the current settings of the alarms. Press the UP  button to
view LIMIT 1 or the DOWN  button to view LIMIT 2. The display will revert back to normal after a few seconds.
When in the Menu, the UP  and DOWN  buttons are used to scroll through the menu options or edit data within
the options.
3.2.4 RECALL BUTTON
The RECALL button toggles between the maximum and minimum readings. The display will revert back to normal
after a few seconds. The RECALL button, when used with the RESET button, also resets the maximum and minimum
readings or total (when in Totalizing mode).
When in the Menu, the RECALL button reverts back one level without saving any changes () or exits the Menu
().
4.0 OPERATION
4.1 Modes of Operation –Channel 1
There are a number of different modes of operation. These modes determine what is shown on the display for any given
input to the instrument. Basically, it determines what computation is performed on the input. The input signals are on
Channel 1 (Signal inputs). The user can set the sense of the input, positive or negative. The AUXiliary input (Channel 2) can
be used to control the signals on Channel 1. Refer to Section 5.0 for details on changing modes.
NOTE: The instrument is programmed from the factory in the RPM Mode for one pulse per revolution.
4.1.1 RPM Mode
In the RPM Mode the unit behaves like a tachometer displaying revolutions (revs) per minute (RPM) from an input of
1 pulse per revolution. The instrument effectively multiplies the input frequency (pulses per second) by sixty to derive
RPM. In this mode, the range of the unit is 5 to 999,990 RPM. The RPM LED on the bottom right of the display area
illuminates to indicate the RPM mode is programmed. The AUXiliary input (Channel 2) can be used to inhibit (disable)
the signal into the unit.
NOTE: For applications with more than one pulse per revolution, the Scale Mode (see below) must be used to
display RPM or other rates.
4.1.2 Frequency Mode
In the Frequency Mode, the unit displays input pulses per second or more commonly, Hertz (Hz). This is the most
basic mode of operation. The range of measurement in this mode is 0.0833 to 250,000 Hz. The AUXiliary input
(Channel 2) can be used to inhibit (disable) the signal into the unit
4.1.3 Scale Mode (Ratemeter)
In the Scale Mode of operation, the input frequency (pulses per second) is multiplied by a constant, which is set by the
user, and displayed. This allows the user to scale the input to obtain a read out in any units required: RPM, inches per
second, meters per hour, yards per fortnight, and so on. The scale factor may be set anywhere from 0.0001 to 99,999.
The AUXiliary input (Channel 2) can be used to inhibit (disable) the signal into the unit.
4.1.4 Single Event Capture (SECAP) Mode
The SECAP (Single Event Capture) Mode is just like the Scale Mode except that only one reading is made. The
RESET button is pressed to start each new measurement. The unit will then use the next input pulse to start a
measurement, then the next input pulse will end the measurement. In the other tachometer modes, the unit will keep
acquiring pulses until 10 mS (STD gate) or 1 mS (FAST gate) has passed so it can give an accurate reading. The
SECAP Mode sacrifices accuracy as measurements get shorter than 32 mS (STD gate) or 4mS (FAST gate), but it is
the only way to measure single (non-repeating) events. The AUXiliary input may be used for the second pulse input if
two sensors are used, the first pulse on Channel 1 will start the process and the second pulse on Channel 2 (AUX) will
stop the process. Refer to Appendix C - Using the Single Event Capture Mode.
4.1.5 Rate of Change (ROC) Mode
In the Rate of Change Mode, the unit displays the rate of change of the input frequency (pulses per second). The unit
measures the input frequency times the scale factor set by the user. A moment later it measures the input frequency
again. The difference of these two, scaled frequencies is divided by the time interval between the two measurements.
Several measurements are averaged then displayed.
The scale factor allows the user to scale the input to obtain a read out in any units required: RPM per Minute
(RPMPM), inches per second per second, meters per hour per minute, yards per fortnight per second, and so on. The
scale factor may be set anywhere from 0.0001 to 99,999.

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In this mode:
The display is updated up to once every two seconds with the average Rate of Change.
The throughput of the max/min, analog outputs, and relays is up to twice a second.
The display will show a positive number when the frequency is increasing and a negative number when the
frequency is decreasing.
Remember that even a small change in RPM over a short time will cause a large Rate of Change (average acceleration)
to be displayed. The gate time for each measurement is about 1/3 of a second. For instance, if you use a digital
function generator to change from 3000 RPM to 3001 RPM, the change will happen all at once. You will see that it
happens within 1/3 of a second. So 1 RPM change in 1/3 of a second is 180 RPM over one minute or 180 PRMPM
acceleration.
4.1.6 Totalizing Mode
In the Totalizing Mode, each input pulse causes the display to be incremented by a constant value that is set by the
user. This enables the user to scale the input to obtain a read out in any measure required: number of inches, number of
bottles, number of revolutions, and so on. The scale factor may be set anywhere from 0.0001 to 99,999. The total can
be reset using the RESET and RECALL buttons pressed together on the front panel. The AUX input (Channel 2) can
be set to reset the totalizer and turn the unit into a batch counter or to inhibit the input signal (see Section 4.2.4).
4.2 Modes of Operation –Channel 2
Channel 2 is the AUXiliary input and is basically used to control the input to Channel 1, or can be used as an external reset
for the input channel or the Alarms. The user can set the sense of the input, positive or negative. The input has a weak pull-
up resistor internally so it can be used with a potential free contact. All modes are mutually exclusive –only one mode may
be active at any time. Refer to Section 5.0 for details on changing modes.
NOTE: The instrument is programmed from the factory with the AUXiliary input disabled (OFF).
4.2.1 Off
When programmed OFF this input has no effect.
4.2.2 Inhibit
If programmed as an inhibit pin, it will disable the signal input when asserted (high or low depending on the sense
programmed). It acts as a gate preventing the input signal from updating the unit.
4.2.3 Single Event Capture
When programmed as Single Event Capture () this input acts as the second input for the external signal –see
Section 4.1.4 above.
4.2.4 External Reset –Input Totalizer
If programmed as External Reset for Inputs (), when asserted (high or low depending on the sense programmed),
it will reset the display (count) to Zero. Used in the Totalizer Mode (see Section 4.1.6) to enable the unit as a batch
counter.
4.2.5 External Reset –Alarms
If programmed as External Reset for Alarms (), when asserted (high or low depending on the sense
programmed), it will reset any Alarms and drop out any Contact closures. Note: The alarms need to be set up correctly
(see Section 4.4).
4.3 Decimal Point
The decimal point on the display may be fixed from 1 to 3 places or may be set to none (only whole number displayed). As
the display increases the unit will automatically drop decimals to show whole number values. Note that for values larger
than 99999 all decimal points light indicating the current reading is x10.
4.4 Alarm Limits
The ACT-3X has two independent alarm set points, referred to as LIMIT 1 and LIMIT 2 (Set 1 and Set 2 on the menu).
These limits are fully programmable by the user (unless the write protect option has been set). The limits may be set as high
or low with an option of low limit lockout, latching or non-latching at any value. The limits are accurate to better than
±0.1% of the set point value. Refer to Section 4.7.2 for the limit response time. The dead band (hysteresis) is also
programmable at any value from 0.0001 to 99.999% of the set point value. The actual output from these alarms is a set of
form C, dry contacts, accessible via barrier strip screw terminals on the rear panel. These contacts are capable of switching 1
A at 250 Vac. When the unit is making measurements, the limits can be viewed by pressing the UP  button for LIMIT 1
or the DOWN  button for LIMIT 2. The display will return to normal after a few seconds. The relays may also be set to
be Failsafe, which inverts the sense of the relay so that they are energized under normal condition. In the event of a power
failure the contacts will drop out as they would during an alarm condition. Refer to Section 5.0 to set limit set points.

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4.4.1 Latching vs. Non-Latching Limits
A Latching Limit is one which, when the alarm trips, remains in this condition regardless of what the input may do.
This tripped limit needs to be manually reset by the operator to restore it back to its normal position. Reset is via the
front panel RESET button or remotely using Channel 2 Auxiliary input if programmed. A Non-Latching Limit, on the
other hand, will automatically reset itself when the input no longer exceeds the set point, either high or low. The user
can program each limit to be Latching or Non-Latching. Refer to Section 5.0.
4.4.2 Dead band (Hysteresis)
Dead band is only applicable to non-latching limits. Dead band is a value that is added to the set point (in the case of a
low limit) or subtracted from the set point (in the case of a high limit) so that this new value (set point ± dead band)
becomes the reset point for the alarm. The primary purpose of this function is to prevent the alarm relays from
chattering when the input value remains very close to the set point. Dead band is set in absolute engineering units. For
example if the Limit is set to 200 RPM as a High limit and the dead band is set to 20 RPM, the alarm will trip when the
input is greater than 200 but will not reset until the input goes below 180 PM. Without the dead band feature, the alarm
relays would chatter on and off it the input varied from 199 to 201, which is undesirable. The user can set the
hysteresis to any value from 0.0001 to 99,999. Refer to Section 5.0.
NOTE: The Dead band needs to be less than the setpoint.
4.4.3 Low Limit Lockout
The Low Limit Lockout is a feature that prevents a low alarm from tripping when the input starts from zero. The low
alarm essentially is locked out and will not operate until the input exceeds the low limit, at which time the low alarm is
enabled and will trip when the input goes below the set point. This feature enables a motor that has a low speed cut out
(low alarm) to start from rest without having to short out the normally closed relay contacts externally. This feature
may be enabled or disabled by the user. Refer to Section 5.0.
4.4.4 Fail Safe
The Fail Safe option reverses the sense of the relays, essentially energizing them under normal conditions. When an
alarm is set, the relays will drop out (become de-energized). Thus in the event of a power failure the relays will drop
out by default creating the equivalent of an alarm condition.
4.5 Analog (AO) and Current (IO) Output
The ACT-3X has options for voltage (0 to 5Vdc) or current (4 to 20mA) outputs.
The analog outputs are derived from a 15-bit digital to analog converter. This means that the output voltage (or current)
changes in steps. The standard analog output has ~32,000 steps from zero to full scale. This implies that each step size is
1/32,000 of the full-scale value or about 0.003% of full scale. The user can set the actual full scale value anywhere from 1
to 999,990. This full-scale value is the value at which the analog outputs are at a maximum, 5 Vdc or 20 mA.
The zero and full-scale range is usually set to give a reasonable working range for the analog output. For example, if you
are measuring the RPM of a motor that typically runs at 1700 RPM, you may want to set the zero scale (offset) for 1000 and
the full-scale for the analog output at 2000. Note that the zero and full scale ranges are always set in the units you choose to
display; RPM in this case. The output voltage will then be 5 Vdc (20 mA) for an input of 2000. It will be linear between
1000 (zero scale) and 2000 (full-scale). Thus, at 1700 RPM the output will be:
(1700 - 1000)
—————— X 5 Vdc = 3.5 Vdc
(2000 - 1000)
(2000 - 1000)
Resolution = —————— = 0.03 RPM
32,000
NOTE: For any input below the zero scale setting, the outputs will be at 0 Vdc or 4 mA. For any input above the full scale
setting, the outputs will be at their maximum value, 5 Vdc or 20 mA.
4.6 Maximum and Minimum
The unit tracks and saves the maximum and minimum values. These values are continuously updated and can be viewed at
any time by pressing the RECALL button on the front panel. The first time this button is pressed the MAXimum is shown,
indicated by the MAX light to the right of the display. Pressing the RECALL button a second time shows the MINimum.
The user can also reset these values by pressing and holding the RECALL button and then pressing the RESET button.
The next reading will always update both values. This will keep the minimum value from showing zero unless there was a
zero reading after the RECALL and RESET buttons were pressed.
Thus, if you start a motor, for example, from zero, the minimum will start recording with the first reading. Usually the user
will reset the minimum once the motor is up to speed. When slowing to a stop, the minimum will naturally tend to zero, but
the maximum will be retained.

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4.7 Throughput
Throughput is a measure of how fast the instrument processes data. The rate at which the instrument acquires data is a
function of the ―Gate Time‖ and the input frequency. The instrument gets a start pulse then it continues to get pulses until
the Gate Time elapses. The next pulse ends this measurement and starts the next. At frequencies slower than the Gate Time,
the update rate is equal to the period of the input frequency. Eventually, the instrument has to make the decision that the
input is zero, because theoretically it could wait forever for the next pulse. This Low-End timeout is programmable.
4.7.1 Display Update Rate
Although the instrument can update up to 244 times a second, to display the data at this rate would result in a totally
erratic display. Therefore, the instrument limits the display update rate to once every ½ second. Obviously if the input
pulses are spaced more than ½ second apart, the instrument will not have any new data until the next pulse comes
along, and the time to update will be greater than ½ second. The point at which the update rate becomes longer than
every ½ second is when the period of the input (time between pulses) is greater than ½ second, which is 2 Hz or 120
RPM. Thus, for an input greater than 2 Hz or 120 RPM, the update rate is twice a second.
For very fast inputs, the unit averages the readings between display updates so that the value displayed is an average of
the total number of acquisitions since the last update.
4.7.2 Internal Update Rate - GATE
The rate at which the limits are checked, the analog output is updated, and the minimum and maximum are updated, is
at the maximum rate at which the instrument acquires data. This is set by the GATE menu item. The Gate Time can be
set to 32.786 mSecs (STD) or 4.096 mSecs (FAST). See Section 5.1.4 for more details.
The STD setting is slower (up to 31 readings per second) but gives more accurate readings especially for the maximum
and minimum readings. Below 31 Hz or 1860 RPM, the internal update rate is the period of the input frequency. Thus,
the response of the alarms, etc can be seen to be a function of the input. Above an input of 31 Hz, the alarms respond
within 66 milliseconds. Below this input they respond within (1 input frequency) seconds.
The FAST gate time is faster (up to 244 readings per second) but is less accurate (about 0.025% of reading worst case
at high frequencies). Below 244 Hz or 14,640 RPM, the internal update rate is the period of the input frequency. Thus,
the response of the alarms, etc can be seen to be a function of the input. Above an input of 244 Hz, the alarms respond
within 9 milliseconds. Below this input they respond within (1 input frequency) seconds.
At input frequencies below 31 Hz or 1860 RPM there will be no difference in the two settings.
The instrument has a special feature to allow it to quickly respond to rapid deceleration and still measure down to 5
RPM with 1 pulse per revolution. (To measure to 1 RPM, 5 pulses per revolution are required). After receiving no
input pulses for about 67 milliseconds for the Standard gate mode or 37 mSecs for the Fast gate mode, the instrument
will calculate a reading as though an input pulse had just occurred. If this new reading is less than the last reading, the
instrument uses it. Until an input pulse is detected or the Low-End timeout is reached, the instrument will ―force‖
another reading every 33 milliseconds. These ―forced‖ readings will update the analog output, limits, and the max/min.
The last ―forced‖ reading of every ½ second will be displayed every ½ second. The Low-End timeout can be set to 12,
1 or 0.5 seconds. Refer to Section 5.1.3 for details.
4.7.3 Low End
Low End is applicable to RPM, FREQ, SCALE, and SECAP Modes only. Low End selects how many seconds may
elapse between input pulses before the unit displays the reading zero. There is a tradeoff between the lowest reading
available and how quickly the unit responds when the input pulses stop and displays 0. There are three values: 12
seconds, 1 second, and 1/2 seconds. In the RPM mode, with one pulse per revolution, these settings correspond to the
lowest RPM reading of 5, 60 and 120 RPM respectively.
4.8 PULSE OUTPUT
The Pulse Repeater Output provides a conditioned TTL positive going 5 V pulse out for each pulse in. The sense of the
output, high pulse or low pulse, is programmable by the user. See Section 5.9.
5.0 USING THE MENU
To enter the MENU Mode, press the SET button. The display will show the first top-level menu item, which is  for
Channel 1 setup. Continuing to press the SET button will cycle through all options and show the current settings. At any point
press the RECALL button to back out () the current setting. Pressing RECALL again will eventually exit from the Menu.
Once in the MENU Mode, with  displayed, press the UP  or DOWN  buttons to cycle through the top-level menu
options.
The top-level menu choices are:
 Channel 1 - Set up parameters for Channel 1 –the primary input Channel
 Channel 2 - Set up parameters for Channel 2 –the Auxiliary Input Channel

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 Decimal Point- Set the number of Decimal Points displayed on the unit
 Set point 1 - Set up parameters for Alarm 1
 Set point 2 - Set up parameters for Alarm 2
 Digital Analog Converter 1- Set up parameters for the Analog Output (Option)
 Baud Rate - Set up the baud rate for the serial port (Option). Only seen if the option is installed.
 Ethernet - Set up the Ethernet port address, subnet mask and gateway. Only seen if the option is installed.
 Pulse Output - Select the polarity of the pulse output
 Display Rate - Select the display update rate
 Serial Number - Display the Serial Number
 Passcode - Display or set the pass code to protect the Menu
When at the desired menu option, press the SET button to enter into that specific menu option.
5.1 
Sets the mode of operation. This menu item has a number of sub items. Once selected with the SET button, the instrument
will display its current mode. To exit back to the main menu without changing the mode, press the RECALL button. If you
wish to change the operating mode, you can view the options using the UP  button. The available options are shown
below and are described in Section 4.1. When the desired mode is displayed, press the SET button. The unit will return to
the main menu.
5.1.1  TYPE - Press the SET button to enter the sub menu selections shown below and use the UP 
button to scroll through the options. See Section 4.1 for details on each type.
5.1.1.1  RPM - Sets the unit into RPM mode.
5.1.1.2  FREQ - Sets the unit into Frequency (Hz) mode.
5.1.2  SCALE -Sets the unit into Scale mode. User must then specify a scale factor from 0.0001 to
99,999. Press the SET button to display the current scale factor value and use the buttons to set the
required scale factor. Press RECALL to exit up one level without making a change or press SET
to save the change. The edit buttons function as follows:
RESET - changes the digit being edited (blinking digit)
UP  - increases the digit by 1
DOWN  - decreases the digit by 1
RESET +  - shifts the decimal point
RECALL - aborts the edit process
SET - saves data and exits
5.1.2.1  SECAP - Sets the unit into Single Event Capture mode. User must then specify a scale factor
from 0.0001 to 99,999. Press the SET button and use the buttons (as described in SCALE
above) to set the required scale factor value. Press RECALL to exit up one level without
making a change or press SET to save the change.
5.1.2.2  ROC - Sets the unit into Rate of Change mode. User must then specify a scale factor from
0.0001 to 99,999. Press the SET button and use the buttons (as described in SCALE above) to
set the required scale factor value. Press RECALL to exit up one level without making a
change or press SET to save the change.
5.1.2.3  TOTAL - Sets the unit into Totalizer mode. User must then specify a constant value from
0.00001 to 99,999. Press the SET button and use the buttons (as described in SCALE above)
to set the required constant value. Press RECALL to exit up one level without making a
change or press SET to save the change.
5.1.3  INPUT - Press the SET button to change the sense of the input trigger and use the UP  button to
select NEGative or POSitive. Press the SET button to select the new setting or the RECALL
button to exit without saving the settings.
5.1.4  LOEND - Visible only in RPM, FREQ, SCALE and SECAP modes. Press the SET button to enter
the settings for the Low End measurement (how long the unit waits for a measurement before
showing Zero) and use the UP  button to scroll through the options described below. Press the
SET button to select the new setting or the RECALL button to exit without saving the settings.

Page 10
5.1.4.1  12 SEC - Sets the Low End to 12 Seconds, equivalent to 5 RPM.
5.1.4.2  1 SEC - Sets the Low End to 1 Second, equivalent to 60 RPM.
5.1.4.3  HALF - Sets the Low End to 1/2 Second, equivalent to 120 RPM.
5.1.5  GATE - Press the SET button to enter the settings for the GATE time (internal measurement rate)
and use the UP  button to scroll through the options described below. Press the SET button to
select the new setting or the RECALL button to exit without saving the settings.
5.1.5.1  STD - Sets the gate to the Standard rate –32.768 msec.
5.1.5.2  FAST - Sets the gate to the FAST rate –4.096 msec.
5.2 
Sets the Auxiliary input function. This menu item has a number of sub items. Once selected with the SET button, the
instrument will display its current function. To exit back to the main menu without changing the function, press the
RECALL button. If you wish to change the function, you can view the options using the UP  button. The available
options are shown below and are described in Section 4.2. When the desired function is displayed, press the SET button.
The unit will return to the last menu level.
5.2.1  TYPE - Press the SET button to enter the sub menu selections shown below and use the UP 
button to scroll through the options.
5.2.1.1  OFF - Turns OFF the Aux input so that it has no function.
5.2.1.2  SECAP - Sets the Aux input to be the second input for the SECAP mode. See Section 4.2.3.
5.2.1.3  INHIBIT - Sets the Aux input to disable the input. See Section 4.2.2.
5.2.1.4  RESET INPUT - Sets the Aux input to RESET the current Display Total Value. See Section
4.2.4.
5.2.1.5  RESET ALARM - Sets the Aux input to be the ALARM reset. See Section 4.2.5.
5.2.2  INPUT - Press the SET button to change the sense of the Aux input and use the UP  button to
select NEGative or POSitive. Press the SET button to select the new setting or the RECALL
button to exit without saving the settings.
5.3 
Sets the decimal point on the displayed reading. To enter this menu item press the SETbutton. The unit will display the
current decimal point setting. To select a different decimal place, press the UP  button, which will toggle between 1, 2, 3
and NONE. Press the SET button to change the decimal point setting to the option displayed and exit back to the menu. To
exit back to the main menu without changing the mode, press the RECALL button.
5.4 
Used to set or show the ALARM 1SETUP parameters. This menu item has a number of sub items. Once selected with the
SET button, the instrument will display its current setting. If you wish to change the alarm setup, you can view the options
using the UP  button. The available options are shown below and are described in Section 4.4. When the desired
function is displayed, press the SET button. The unit will return to the last menu level. To exit back to the main menu
without changing the values, press the RECALL button.
5.4.1  Set Type - Select the ALARM TYPE. Press the SET button to enter the sub menu selections
shown below and use the UP  button to scroll through the options. Press the SET button to
select the new setting or the RECALL button to exit without saving the settings.
5.4.1.1  OFF - Turns the Alarm OFF so that it has no function.
5.4.1.2 HIGH - Sets the Alarm to HIgh type.
5.4.1.3 LOW - Sets the Alarm to LOw type.
5.4.2  LATCH - Press the SET button and use the UP  button to select whether the Alarm is
LATCHing –select YES, or NON-LATCHING –select NO. Press the SET button to select the
new setting or the RECALL button to exit without saving the settings.
5.4.3  LOCK - Press the SET button and use the UP  button to select whether the Alarm will LOCk
out –select YES, or NO. Press the SET button to select the new setting or the RECALL button to
exit without saving the settings.

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5.4.4  FAIL SAFE - Press the SET button and use the UP  button to select whether the Alarm is FAIL
Safe –select YES, or NO. Press the SET button to select the new setting or the RECALL button to
exit without saving the settings.
5.4.5  SET POINT - Press the SET button to display the current SET POINT value and use the buttons
to set the required value. Press RECALL to exit up one level without making a change or press
SET to save the change. The edit buttons function as follows:
RESET - changes the digit being edited (blinking digit)
UP  - increases the digit by 1
DOWN  - decreases the digit by 1
RESET +  - shifts the decimal point
RECALL - aborts the edit process
SET - saves data and exits
5.4.6  DEAD BAND -Press the SET button to display the current DEAD BAND value and use the
buttons to set the required value. Press RECALL to exit up one level without making a change or
press SET to save the change. Edit the value using the buttons as shown in  above.
5.5 
Same as  but for ALARM 2.
5.6 
Used to set or show the Analog Output (Option) parameters. This menu item has a number of sub items. Once selected
with the SET button, the instrument will display its current setting. To exit back to the main menu without changing the
function, press the RECALL button. If you wish to change the function, you can view the options using the UP  button.
The available options are shown below. When the desired function is displayed, press the SET button. The unit will return
to the last menu level.
5.6.1  ZERO SCALE - Sets the Zero Scale value for the Analog output. Press the SET button and use
the buttons to edit the value as per  above. Press RECALL to exit up one level without
making a change or press SET to save the change.
5.6.2  FULL SCALE - Sets the Full Scale value for the Analog output. Press the SET button and use the
buttons to edit the value as per  above. Press RECALL to exit up one level without making a
change or press SET to save the change.
5.6.3  DIAGNOSTIC - Sets the analog output to a preset value for diagnostic purposes. Options are
, or  (Zero) scale. Press RECALL to exit up one level without making a change or
press SET to save the change.
5.7 
Sets the BAUD rate for serial communication (Option). Press the SET button to display the current baud rate. Press the UP
 button to view the baud rate options: .- 115200, .- 57600, .- 38400, .- 19200, .- 9600, .- 4800,
.–2400. When the desired mode is displayed, press the SET button to select or the RECALL button to ignore. The unit
will return to the menu.
5.8 
Sets the IP Address for the Ethernet interface (Option). There are three sub items:  –IP Address,  –Sub Net Address,
 –Gateway Address. These addresses are in the format 192.168.000.100. Use the buttons to edit the values as required.
RESET - changes the digit being edited to the right. Will stop at the right most digit
RESET + - changes the digit being edited to the left. Will stop at the left most digit
UP  - increases the digit by 1
DOWN  - decreases the digit by 1
RECALL - aborts the edit process
SET - enters the sub menu item for editing and when pressed again saves data and exits
5.9 
Sets the sense for the Pulse Output. Press the SET button to change the sense of the Pulse Output and use the UP  button
to select NEGative or POSitive. Press RECALL to exit up one level without making a change or press SET to save the
change.
5.10 
Sets the Display Update Rate. Press the SET button to change the display update rate and use the UP  button to select ½,
1or 1.5 second update rate. Press RECALL to exit up one level without making a change or press SET to save the change. 

Page 12
5.11 
Used to view the Serial Number of the unit. Use the SET button to view the serial number and the RECALL button to
return to the main menu.
5.12 
Display or set the pass code to protect the menu. When setting or entering a pass code, the edit buttons function as follows:
RESET - changes the digit being edited (blinking digit)
UP  - increases the digit by 1
DOWN  - decreases the digit by 1
RECALL - aborts the edit process
SET - saves data and exits
6.0 SERIAL OUTPUT
The ACT3X has can have an optional USB, Ethernet or RS232C compatible serial interface. The USB connection is a Type B
socket, the Ethernet is a standard RJ45 port and the RS232 interface is made via a 9-pin miniature D connector on the rear panel.
See Section 2.3.7 for connection details. The instrument is not supplied with serial interface cables.
The instrument sends and receives various information out through the serial interface. Under normal operation, the status of the
limits is sent as each event occurs. The user can also request the actual value of the display be sent on a continuous basis. The
user can also request the minimum and maximum values be sent on demand, as well as the current set up of all parameters of the
instrument and program the unit remotely. Software is available to allow programming and to show real time data, or export the
real time data to an ExcelTM spreadsheet.
The instrument is fully programmable via the serial interface. The user can remotely set the modes, limits, hysteresis, scale
factors and so on, as well as reset either or both the limits.
6.1 Data from the Serial Interface
The messages below are sent from the instrument as each event occurs. Other information is sent on demand and is covered
in the following section.
The messages are sent as standard ASCII and all messages end with a carriage return <CR>. There is no Line feed sent.
However, most terminals, printers and computers have the ability to automatically add a Line feed to a carriage return.
SS1 LIMIT 1 has tripped
SS2 LIMIT 2 has tripped
SR1 LIMIT 1 has reset
SR2 LIMIT 2 has reset
SR3 Both Limits have been forced to reset (RESET button pressed)
If the user sends a Send display Data (@D1) command, the front panel display value is transmitted at the display update rate
(Refer to Section 4.7.1). This data is sent as it is displayed on the unit.
@D1 will send data continuously
@D2 will stop data from being sent
@PIwill identify the unit
@C1 will send over the current configuration
6.2 Serial Commands
The instrument responds to a number of commands sent to its serial port. All commands begin with @end with a carriage
return <CR>. All illegal data is ignored.
There are basically two groups of commands. The first group are Run Mode commands and do not affect the operation of
the unit, other than the execution of the command. The second group is Control commands that require further information
from the operator.
NOTE: Control commands suspend operation of the instrument until completed.
6.2.1 Run Mode Commands
These commands do not interfere with the operation of the instrument. They result in an action only. All commands
are activated after the carriage return <CR> or <Enter> is pressed. Commands entered are not echoed back to the
user. However, the results, if any, are sent back to the user.
The following are valid Run Mode commands. Enter the command and then <CR>.
Command Action Response
@D0 Send current displayed value Unit sends current displayed value once
@D1 Send display data Unit sends display data until @D2 command

Page 13
@D2 Stop sending display data Unit stops sending display data
@D3 Send last calculated reading This value is changed as fast as the throughput of the ACT unlike the
@D0 command that gives the last displayed value which only changes up
to 2 times per second. In the Rate of Change (ROC) mode this command
will give the last RPM measured. To get the displayed ROC value, use the
@D0 or @D1 commands.
@MX Send Maximum value Unit sends Maximum value once
@MN Send Minimum value Unit sends Minimum value once
@RE 32 Reset Maximum value Unit sends OK when done
@RE 64 Reset Minimum value Unit sends OK when done
@RE 96 Reset Max and Min Unit sends OK when done
6.2.2 Control Commands
NOTE: Control commands may affect the operation of the instrument so the user should proceed with caution
if the unit is in an operational environment. CAUTION: Relays may drop out or pull in during set up.
A COMMAND is an instruction to the unit to change one or more of its operating parameters. It consists of the @
symbol followed by the Command (,) a category (, or =) and an argument followed by a carriage return (Enter). If a
command is given without an argument, the unit will return the current setting. For example: @CH_1,TYPE=RPM will
change the mode to RPM and @CH_1,TYPE will return the answer RPM. In some cases the argument is followed by a
numerical value. For example: @CH_1,TYPE,SCALE=60.0 will change the scale factor to 60.0. (NOTE: The unit
must be set to the Scale Mode first for the Scale factor to be recognized.) Incomplete commands will be ignored.
The following are valid Control Commands:
Command,Category (eg. @CH_1,TYPE will return the current Type setting for Channel 1)
Command,Category = Argument (eg. @CH_1,TYPE=ROC sets the Channel 1 Type to Rate of Change)
Command,Category,Argument = Value (eg. @CH_1,TYPE,SCALE=60.0 sets the Scale Mode Scale factor to 60.0)
Command = Argument (eg. @DECPT=NONE sets the Decimal Point to none)
Command Category Argument Action
@CH_1 (Channel 1)
TYPE
RPM Sets scale to 60 so displays in RPM.
FREQ Sets scale to 1 so displays in hertz.
SCALE Scale mode. Enter Scale factor.
SECAP Single Event Capture. Enter Scale factor.
ROC Rate of Change. Enter Scale factor.
TOTAL Totalizer. Enter Totalize Scale factor.
INPUT POS or NEG Select from POS or NEG edge triggering.
LOEND 12SEC, 1_SEC, HALF Set how long with no pulses before the tachometer zeroes.
GATE STD, FAST Select from STD (1/100 Second), or FAST (1/1000 second).
NOTE: To set the mode use the equal sign after TYPE, eg. @CH1,TYPE=SCALE.
To set a scale factor use TYPE followed by the argument and the equal sign, eg. @CH1,TYPE,SCALE=60.0
@CH_2 (Channel 2 (AUX input))
TYPE
OFF Turn the Aux input OFF
SECAP Aux input is second input for SECAP
INHBT Aux input will enable/disable primary input (acts as a gate)
RSTIN Aux input will reset total
RSTAL Aux input will reset Alarms (drop out contacts)
INPUT POS or NEG Select from POS or NEG edge triggering.
@DECPT NONE, 1, 2, or 3 Set the maximum number of decimal places to be displayed.
@SET1 Settings for Setpoint (Alarm) 1
STYPE OFF, HI, LO Select the Alarm type as High, Low or Off
LATCH NO, YES Select whether the Alarm is latching
LOC NO, YES Select whether the Alarm has a low level lockout.
FAILS NO, YES Select whether the Alarm is fail safe.
SETPT xxxxx Enter the setpoint xxxxx = value. (In same units as measurement)
DEADB xxxxx Enter the dead band xxxxx = value. (In same units as measurement)
@SET2 Same as SET1 but for Setpoint (Alarm) 2
@DAC1 Settings for the Digital to Analog Converter.
0SCAL xxxxx Set the Analog out Zero scale. xxxxx = value in measurement units
FSCAL xxxxx Set the Analog out Full scale. xxxxx = value in measurement units
DIAG ZERO, HALF, FULL This sets the analog output to ZERO, HALF, or FULL scale.

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@BAUD Will display the BAUD rate in kbyte/sec
@ENET Will show the Ethernet Address settings. IP Address, Sub net
mask and Gateway Address
@OUTPT POS or NEG Select the polarity of the pulse output.
@DSPLR HALF, 1_SEC, 1.5_S This sets the maximum display update rate to ½, 1 or 1½ second.
@SERNO View the serial number of the unit.
@PASSC xxxxx Set this to 00000 for no passcode. Otherwise the user must
enter the xxxxx passcode to enter the menu.
If a user tries to enter too many characters, or enters illegal data, the instrument will respond with Err and will abort
the process. If the command is successfully executed, the instrument will again send the OK message.
7.0 SPECIFICATIONS
Speed Range
5 RPM to 999,990 RPM
(speeds below 5 RPM are possible with multiple pulses per revolution)
Input Frequency Range
0.083 Hz to 250 KHz
Totalizer / Counter
Display Range: 0.001 to 99,999
100,000 –999,990 (only top 5 digits are shown -- x10)
Maximum # of counts of 16,777,216 even with a 0.001 scale
Input Configuration
and
Voltage Range
Universal inputs: 1 to 9,999 pulses per revolution
Front panel push button programmable
TTL input and 1.1 V to 50 Vac signals –Opt: -1 to -50 Vdc
Accuracy
±0.001% of reading or ±1 displayed resolution (Standard Gate)
±0.01% of reading or ±1 displayed resolution (Fast Gate)
Resolution
Fixed Range Mode Auto Range Mode
1 RPM (5 to 99,999 RPM) Up to 0.001 RPM
10 RPM (100,000 to 999,990 RPM)
Display
5 digits 0.56 inch high red seven segment LED
Display Update
Menu selectable between: 0.5 second above 120 RPM, 1 Second above 60 RPM, 1.5 Second
above 40 RPM
Max Measurement Rate
Up to 100 times per second (Standard Gate) or up to 1000 (Fast Gate)
Dependent on input frequency. Input must be > measurement rate
Scale Mode
Scaling Computation
Programmable scaling 0.0001 to 99,999
Front panel push button programmable
Decimal Point
User Selectable (0-3 decimal places max)
Front panel push button programmable
Memory
Maximum and minimum recall from front panel push buttons
Dimensions
1/8 DIN by 3.94‖ [100 mm] deep
Panel cut out: 1.74‖ H x 3/58‖ W [44 mm x 91 mm]
Input Power
Standard 100 - 240 Vac (50/60 Hz) 8VA
Or Optional 12 Vdc or 24Vdc isolated 6W
Recommended Sensors
Optical –ROS-W Infrared –IRS-W
Optical –ROS-HT-W-25 Laser –ROLS-W
Optical –ROSM-5W Laser –SLS-115/230
Proximity –P5-11 Mag/Amp –MT-190W
Magnetic –M-190W Gas Engine - GE-200
Sensor Power Output
12Vdc @ 60mA standard, or optional 5Vdc @ 60mA or 24Vdc @ 30mA to sensor
Pulse Repeater Output
TTL
0 to 5 V TTL compatible, one pulse out for each pulse in
Menu selectable polarity
Serial Interface
Bi-directional RS232C, USB or Ethernet Interface
Analog Output
Voltage (AO): 0 to 5 Vdc, 5 mA max load, Isolated or Non-isolated
OR
Current Source (IO): 4 to 20 mA (500max load with internal 12V Compliance Voltage),
Isolated or Non-isolated. (1-5V with 250load resistor)
15 bit resolution. Front panel push button programmable for full scale and offset RPM ranges.
Alarm Capability
Two alarm set points: High or Low Alarm Limits
Latching or Non-latching
Front panel push button or remotely programmable
Hysteresis and low limit lockout are programmable
Relays can be set as fail safe.
Alarm Outputs
Form C relay contacts, rated 1A at 115 Vac or 230 Vac
Alarm Reset
Automatic or manual reset. Front panel push button programmable
Remote reset via AUXiliary input.
Remote Programming
Unit can be remotely programmed using optional Serial Interface.

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8.0 OPTIONS AND ACCESSORIES / SENSORS
T-5 Reflective Tape - 5 foot (1.5 m) roll, 0.5 inch (10 mm) wide
USB Programming Cable with PM Remote Software:
For use with units ordered with standard Serial Communications, phone plug. Enables the user to program
the ACT-3X using a PC with USB connection. The software also allows remote monitoring of the RPM using
a graphic display or an ExcelTM spreadsheet.
Software available for download at www.monarchinstrument.com
ROLS-W Remote Optical Laser Sensor with 8-foot cable
ROS-W Remote Optical Sensor with 8-foot cable
ROS-P-25 Remote Optical Sensor with 25-foot cable (must cut plug off)
ROS-HT-W-25 High Temperature Remote Optical Sensor with 8-foot cable
ROSM-5W Remote Optical Sensor, modulated
P5-11 Proximity Sensor with 6-foot cable
MT-190W Magnetic Sensor with Amplifier Module with 8-foot cable
M-190W Magnetic Sensor with 8-foot cable
GE-200 Gasoline Engine Sensor with 23 feet of cable
IRS-W Infrared Sensor with 8-foot cable

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APPENDIX A - SCALING THE ACT FOR ENGINEERING DISPLAYS
The SCALE Mode must be used to display RPM in applications where there is more than one pulse per revolution. Below
describes how to use this mode and other applications that need to be scaled.
When using the scaling function of the ACT Tachometer it is possible to multiply the input signal by any value from 0.0001 to
99,999 making it possible to display the actual output in virtually any format.
The most important thing to note is that the instrument takes all tachometer measurements in pulses per second. The RPM
Mode requires a 1 pulse per revolution input, so it simply uses a built in scale factor of 60.
Input Conversions (Scale Factor) Scales Display To
Pulses 1 Rev 60 Seconds Revs
——— x ——— x ————— = ———
Second 1 Pulse Minute Minute
In an application with multiple pulses per rev:
Input Conversions (Scale Factor) Scales Display To
Pulses 1 Rev 60 Seconds Revs
——— x ———— x ————— = ———
Second N pulses Minute Minute
Therefore, to read out in RPM, the scale factor is 60 ÷ N, where Nis the number of pulses.
Thus, if the system gave out 4 pulses per revolution, the scale factor becomes 60 ÷ 4 = 15. The trivial case is the 60 toothed
gearwheel used in older systems which gave out 60 pulses per revolution, reducing the scale factor to 1, or measuring frequency
(cycles per second) directly.
All that is required to scale the unit is a bit of common sense, a basic knowledge of mathematics (you can of course use a
calculator) and some relationships pertaining to your application (e.g. 1 yard = 36 inches, or 1 yard = 0.914402 meters). Refer to
Appendix B for some useful conversions.
A very useful formula for this application is knowing the circumference of the shaft you are monitoring. This could also be a
speed wheel, tire etc. The circumference = π x diameter (π = 3.14159).
In order to scale we need to know what we want as opposed to what we have, and some relationship between the two. For
example:
1) Suppose we have a wheel turning on a roll of paper measuring its linear speed. The wheel has a diameter of d inches. Each
time the wheel turns one complete revolution, π x d inches (the circumference) of paper moves under the wheel and we get
one pulse into the tachometer. We want to know at what speed we are producing paper in yards per minute.
The input is measured in pulses per second. There is one pulse per revolution, so:
Input Conversions (Scale Factor) Scales Display To
Pulses 1 Rev π x d Inches Yard 60 Seconds Yards
——— x ——— x ————— x ———— x ————— = ————
Second Pulse Rev 36 Inches Minute Minute
Scale Factor Of Comment Gives Read Outs In
(π x d‖) circumference of wheel inches per second
(π x d‖) ÷ 36 36 inches in a yard yards per second
((π x d‖) ÷ 36) x 60 60 seconds in a minute yards per minute
5.2360 x d‖ multiplying the known yards per minute
Say the diameter (d) is 10 inches. We get that pulses per second = 52.36 yards per minute and our scale factor is thus 52.36 for a
10 inch diameter shaft.
2) Suppose we have a shaft turning on a conveyor and we know that for each turn of the shaft, the conveyor moves X inches
and we get one pulse into the tachometer. This step eliminates having to calculate the circumference. If we wanted to know
speed in meters per second then review the following.
The Input is measured in pulses per second. There are X inches per pulse, so:
Scale Factor of Comment Scales Display To
X inches per pulse inches per second
X x 0.914402 ÷ 36 1 yard = 0.914402 meters meters per second
36 inches in a yard
X x 0.0254 multiply out meters per second
The scale factor is thus 0.0254 x X (where X is in inches).