MSI CellScale 3750CS User manual
Page 2 MSI-3750CS RF Weighmeter • User Guide
3750CS CELLSCALE RF DIGITAL WEIGHT INDICATOR
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TABLE OF CONTENTS
INTRODUCTION ...........................................................3
3750CS Display...............................................3
3750CS Front Panel.........................................3
3750CS Block Diagram...................................4
FEATURES ..................................................................4
SECTION 1 – UNIT INSTALLATION ................................5
Power ...............................................................5
Totalize Switch ................................................5
Rear Connectors...............................................5
Table Mount.....................................................6
Wall Mount ......................................................6
SECTION 2 – RF SCALE COMMUNICATIONS .................7
FCC Statement.................................................7
RF Network Description..................................7
Antennas ..........................................................8
RF Network Setup .........................................10
Conguring for multiple networks ................12
Interpreting the RF Bar Graph.......................13
Troubleshooting RF Connection Problems....13
SECTION 3 – SCALE OPERATION ................................15
Power Key .....................................................15
Multiple Scale Channels................................15
Zero................................................................16
Setup Zero......................................................17
Tare ................................................................17
Setup Tare Mode............................................19
Net/Gross .......................................................21
Units...............................................................22
Setup Units.....................................................22
Peak Hold.......................................................22
Print................................................................23
Test.................................................................23
Activate / Deactivate Channels......................23
SECTION 4 – FUNCTION KEYS ...................................24
Dene Function Keys ....................................25
SECTION 5 – ID CODES............................................26
ID Code Organization....................................26
Key Functions during ID Entry .....................27
Using ID Codes..............................................28
Setup ID Codes..............................................31
ID Code String 1 & 2.....................................32
SECTION 6 – TOTAL / STATISTICS...............................33
Total ...............................................................33
Auto Total ......................................................33
Setup Total Menu ..........................................34
Turning Auto Total On & Off ........................35
View Total......................................................36
Clearing Totals...............................................37
Clear All Totals (All ID Codes at once).........37
Statistics.........................................................37
Printing or Outputting Statistics ....................37
Grand Totals...................................................37
SECTION 7 – 3750CS METER SETUP ........................39
Main Setup Menu ..........................................39
A/D Filter.......................................................39
LCD Contrast.................................................40
Lower Display Mode .....................................41
Real Time Clock Calendar.............................41
Set Time & Date ............................................41
Setup Power Menu.........................................42
Bargraph Menu ..............................................43
Locking Scale Features..................................44
SECTION 8 – SET POINTS ..........................................47
Set Point Setup Menu ....................................48
Example Set Point Programming...................50
Relay Output Option......................................55
Relay Applications.........................................56
SECTION 9 – COMMUNICATION PORTS ........................59
Cabling...........................................................59
Output Control Modes ...................................59
Comm Port Parameters..................................60
Comm Port 2 Parameters...............................61
Printer Output Formatting..............................62
Serial Output “@” Commands ......................64
Computer Host Commands............................71
SECTION 10 – CELLSCALE CALIBRATION ...................75
Enable / Reset Calibration .............................75
Calibration Flowchart .................................... 76
Reset All......................................................... 77
Calibrate Setup Menu .................................... 78
Legal Standard............................................... 78
Calibration Procedure .................................... 79
Enable/Disable AZM ..................................... 80
Motion Band .................................................. 81
Center of Zero Indicator ................................ 81
Motion Compensation Option ....................... 82
APPENDIX A – MENU MAPS ..................................... 84
APPENDIX B – ASCII CHART................................... 90
APPENDIX C – SPECIFICATIONS & FEATURES .............. 91
APPENDIX D – INTERNAL WIRING ............................. 93
THE MSI LIMITED WARRANTY................................. 94
MSI-9000 CellScale® System • 3750CS User Guide Page 3
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INTRODUCTION
The Measurement Systems International MSI 3750CS RF Weigh Meter is an element of MSI's CellScale®
System. Combined with 1 or more CellScales, the 3750CS provides complete control over all scale and data
functions. The 3750CS serves as a remote terminal for any CellScale and has no internal measurement capability.
One 3750CS can read the output of many CellScales, and 1 CellScale can also provide data to many 3750CS'.
The large, backlit, alphanumeric display provides precise, unambiguous indication of operating modes such as
Net, Gross, or Total. The 3750CS can calibrate a CellScale remotely and provides a simple user interface to the
advanced features of the CellScale. Digital calibration makes maintaining the system a snap, and the single board,
marine-proof (NEMA 4) construction makes for a rugged and reliable remote indicator. The 3750CS combined
with a CellScale is designed to meet or exceed the requirements of all regulatory agencies.
3750CS DISPLAY
3750CS FRONT PANEL
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FEATURES
• Designed to meet or exceed all US and international standards.
• 6 Large, (.9”) digits for clear weight readings from a distance.
• Reliable 2.4 GHz Frequency Hopping RF communications. Highly immune to interference and multi-path
problems. Range in excess of 600 feet indoors and up to 5 miles line of sight with proper antennas.
• Each 3750CS can act as a terminal for any CellScale. A 3750CS can monitor multiple scales on a single
CellScale, or multiple scales tied to multiple CellScales.
• Up to 32 per connected CellScale ID Codes with separate Alphanumeric Names, Tare, Mode, and Totals. ID
Codes are addressed by any customer given name or number.
• Easy to read annunciation of ID Names and Menu Prompts are provided on eight .5” alphanumeric
Characters.
• Full RS-232 output formatting offers exceptionally versatile data output. Weight data can be printed
in any desired way, the customer can add any alpha characters and/or printer formatting commands,
including formatting for Bar Code printers. The Comm Port is bidirectional allowing computer controlled
operation and data reception.
• Analog bar graph provided for relative to full-scale weight indication. Also used for RF level indication.
• Display illumination uses rugged, long life, LED backlighting coupled with a transective LCD to provide
optimum display contrast under all ambient conditions from full sunlight to total darkness. Operation is
light-sensing automatic or manually set.
• Versatile power input options: AC Only (90-260 VAC 45-65 Hz), 9-36 VDC Input, and 18-60 VDC.
Accessory Power Supplies are available to allow 250 VDC operation as well. A UPS option is available
for the vehicle power supplies.
• Easy to maintain: Full digital calibration assures reliable, repeatable measurements.
• Selectable for lb., kg, g, tons, metric tons, ounces, and per cent (some units and /or units switching may
be prohibited in legal for trade units).
• Multi-mode automatic or manual weight totalizing with multiple ID registers.
• Complete Marine sealing ensures reliable operations under harsh conditions. Rugged cast aluminum package
is coated to resist corrosive atmospheres. Meets all requirements of NEMA 4 and IP66.
• 32 set points standard – programmable for any in-range weight for operator alerts or process control.
Optional Set Point Relay outputs are available for Set Points 1-8. Set point management is performed by the
CellScale, which has 32 programmable set points. The 3750CS has independent set point reaction (relays,
messages, display modes, comm port outputs, etc.).
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SECTION 1 – UNIT INSTALLATION
The 3750CS is simple to setup and use. If there are no peripheral devices such as a printer or scoreboard, setup
consists of installing the mounting bracket (see Appendix A), plugging in the Antenna, and applying power. To
install an RS-232 cable, see the procedure in Section 8, “Comm Port Cabling”.
POWER
The 3750CS is available with three types of power inputs: 1) Universal AC power. Operates from 86 to 265 VAC
45 to 440 Hz 2) Vehicle Power. Available in two ranges, 9-36 VDC or 18-60 VDC. This power supply is transient
protected and ltered for use in vehicles such as cranes, forklifts, etc..
DC Cable Color Code
Blue – Connect to Battery Negative. It is generally best to connect this directly to the battery negative terminal,
or where the negative terminal is attached to the chassis.
Brown – Connect to Battery Positive. Again, a direct battery connection is usually best to avoid interference
with vehicle electrical systems. The 3750CS is internally fused. If connected to a breaker or fuse panel, use 1A
at 12V, .5A at 24V. Fast blow or medium blow fuses are acceptable.
White, Black, and Green – These are reserved for control functions used in specials. Usually these should be
insulated and not wired anywhere. Please consult MSI for more information.
TOTALIZE SWITCH OPTION
When equipped with the totalize switch option, the user is responsible for providing a SPST (single pole, single
throw) momentary switch. This can be a push-button, foot switch, momentary toggle switch, etc..
Totalize Switch Cable Wiring
This input is designed to attach to a momentary SPST switch. Totals are triggered by shorting the blue and
brown wires together. Do not ground either wire. Insulate unused wires.
3750CS REAR CONNECTORS
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3750CS TABLE MOUNT
3750CS WALL MOUNT
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SECTION 2 – RF SCALE COMMUNICATIONS – THE CELLSCALE SYSTEM
INTRODUCTION
The 3750CS is an element of the MSI CellScale System. The CellScale system uses frequency hopping
spread-spectrum RF Modem technology transmitting in the 2.4 GHz ISM band.
RF Modems have been problematic as the RF bands are very hostile, corrupted by noise, path loss and
interfering transmission from other radios. Even in a pure interference-free environment, radio performance
faces serious degradation through a phenomenon known as multipath fading, a problem particularly prevalent
for indoor installations. Multipath fading results when two or more reected rays of the transmitted signal
arrive at the receiving antenna with opposing phase, thereby partially or completely cancelling the desired
signal. Spread spectrum reduces the vulnerability of a radio system to both interference from jammers and
multipath fading by distributing the transmitted signal over a larger region of the frequency band than would
otherwise be necessary to send the information. This allows the signal to be reconstructed even though
part of it may be lost or corrupted in transit.
Spectrum has been set aside at 2.4 GHz in most countries for the purpose of allowing compliant spread
spectrum systems to operate freely without the requirement of a site license. In the USA, there are absolutely
no site licensing requirements. The CellScale system is also programmable for use in most European countries.
Please contact MSI for worldwide compliance information.
FCC STATEMENT
Note: This unit has been tested and found to comply with the limits for a class A digital device, pursuant to part
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the instruction manual,
may cause harmful interference to radio communications. Operation of this equipment in a residential area
is likely to cause harmful interference in which case the user will be required to correct the interference
at his own expense. Commensurate with EIRP limits specied in FCC Rules 15.247b, this device may
not be used with antennas that exceed 36dB of gain in point-to-point applications or 16dB of gain in
multi-point applications.
The Transmitter Module is licensed as FCCID: HSW-2410M.
NETWORK DESCRIPTION
The CellScale system uses frequency hopping which is produced by transmitting the data signal as usual, but
varying the carrier frequency rapidly according to a pseudorandom pattern over a broad range of channels,
in this case 80 discreet frequencies. These 80 frequencies are combined in different “hopping patterns” to
provide 16 separate networks. With minor degradation in channel throughput, this can be doubled to 32
separate networks. The original 16 networks are numbered 00-15, the secondary networks are numbered
16-31. While it is possible to have all 32 networks commingled, some data rate degradation may occur
between networks 16 channels apart (e.g. Network 00 and 16, 01 and 17, 02 and 18, etc.), although in most
situations this degradation will be unnoticable.
The CellScale network uses a ‘Star’ network topology. One unit, usually the scale, is designated a ‘Master’.
The Master transmits a sync pulse on a regular basis, providing synchronization of all remotes in the designated
Network. Thus it forms the center of a cell. MSI provides three products capable of being the master unit:
the CellScale, the CellModem, or the Trans-Weigh CS Crane Scale. Up to 254 slaves can access the master
unit. The 3750CS is always a ‘Slave’. Multiple 3750CS units can coexist on one network, or can be easily
switched to other networks as required.
The CellScale system uses CSMA (Carrier sense multiple access) to arbitrate between multiple remotes. CSMA
is contention-based. Each remote listens to see if the channel is clear and then transmits. If the channel is not
clear, the remote waits a randomly chosen period of time and then tries again.
For more on setting up CellScale networks, please refer to the CellScale manual,
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ANTENNAS
MSI offers the 3750CS with four antenna choices: 1) Standard Antenna – This is a small 1/4 wave antenna that
mounts directly on the 3750CS enclosure and is suitable for most short to medium range applications. 2) Long
Range Antenna – A high gain antenna that is remotely mounted from the 3750CS with a low loss coaxial cable.
This omnidirectional antenna increases the range up to 4 times. The 10' cable allows placement of the antenna
above the 3750CS for ease of clearing possible obstacles to data transmission. An optional reector is available if
a directional antenna is desirable. 3) Patch antenna – For applications where the standard antenna is vulnerable to
physical use or outdoor applications. The Patch antenna is mildly directional which requires more care in antenna
placement for long range applications. Patch Antennas are available by special order only. 4) In extreme range
cases a Yagi Antenna is available by special order. Please contact MSI for details.
Antenna placement is critical to problem free use of your CellScale system.
1) Be sure a relatively clear transmission path exists between the 3750CS and associated CellScale master
devices. The radio signals travel primarily by line of sight (LOS), and obstructions between stations will
degrade the system performance. LOS is less important as distances decrease.
2) When using the long range antenna, mount the antenna on a tower or other elevated structure to ensure
that you have a clear LOS transmission path. This will raise the antenna to a level sufcient to clear
surrounding terrain and other obstructions. It is not necessary or desirable to provide a ground plane
for the antenna.
3) Never use a directional antenna (e.g. a Yagi, or a long range antenna with a reector) on a mobile system.
However, xed station locations can often benet from directional antennas when the location of the other
components of the RF network are always in the same general direction.
4) If using the meter mounted standard antenna, ensure that the antenna is not blocked by any metal.
Transmission is good through most kinds of glass so mounting a meter next to a window should work
ne. If there is no clear line of sight place to mount the 3750CS, consider switching to the long range
antenna so the antenna can be remoted.
5) The standard and long range antennas are vertical plane devices. Do not mount them sideways. They
should always point up. It also works to point them down, when high off the ground (such as on the
underside of a large bridge crane).
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A) Long Range Antenna
If mounted outdoors, seal antenna connectors with 3/4” adhesive heat
shrink (Raychem SCL 3/4 or Sumitomo W3B2 3/4”, MSI P/N 11563).
B) Standard Antenna
Intended for indoor applications. Protect
from rain and sprayed water.
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The 3750CS serves as a terminal for CellScales. Its response to key presses may be delayed due
to transmission times. The 3750CS will on occasion, display a “WAIT” message while transacting
setups and scale controls.
!
RF NETWORK SETUP
The 3750CS is a RF Modem connected device. The RF Modem requires setup to connect to one or
more CellScales.
RF NETWORK
Sets the primary network number. Set this numbers to match the Network number of the CellScale master the
3750CS is associated with most often. Ranges from 0 to 31.
C/S ID
Sets the primary master CellScale ID number. This number must match the Source Address number of the
primary master CellScale. Ranges from 0 to 254.
MY ID
Each slave unit in a given Network must have a unique ID number. Enter up to three digits to designate the
3750CS ID number. Ranges from 0 to 254.
TIMEOUT
Sets the time in seconds (0-1800) that the 3750CS will wait for data from the CellScale. The display will
blank out if no data is received within this time period. Defaults to 10 seconds. Entering 0 turns off the
Time-out timer. MSI recommends at least a 5 second timeout period to handle small lapses in transmissions.
The system defaults to 10 seconds.
ENERGY
Sets the RF power level between 10mW (Low), and 100mW (High). In most applications power should be
set to High. Reduced energy can reduce the size of the coverage/interference zone which may be desirable for
multiple-network applications. Always check for adequate range coverage when using the Low setting.
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Conguring the RF Modem
Assumes F1 is configured as “MODEM”, see “Setup Function Keys”.
1) Push the SETUP key.
2) Push the MODEM key (usually F1). The display
enters the Setup MODEM mode.
3) Push ENTER. The rst menu item is RF NTWK.
The numeric digits indicate the current network.
4) Change the Network number by pushing the numeric
keys. As soon as you start entering numbers the
screen reads “NEW N/W”. Available network
numbers range from 0-31.
In this example we’ll use network 12. Use the appropriate numbers for
your CellScale master. It is not necessary to enter a ‘0’ for networks
below 10.
Push the 1 key followed by the 2 key.
5) Push ENTER to set your Network choice into
memory. The 3750CS tries to contact the new
network while indicating “FINDING”. If the master
unit is on it will connect. If not, the display will
ash briey “NO NETWK”.
The “NO NETWK” or “NO TARGET” messages can be safely ignored at this
time. It indicates only that the chosen network is not on or in range.
6) Push the UP key to the “C/S ID” menu.
7) Use the numeric keys to change the C/S ID
number to match the SRC address programmed in
the CellScale master. Available C/S ID numbers
range from 0-254.
In this example we’ll use source 75. Use the appropriate numbers for your
CellScale master. It is not necessary to enter leading zeros.
8) Push the ENTER key to set the C/S ID.
9) Push the UP key to the “MY ID” menu. This is the
Node ID of this 3750CS slave.
10) This step is optional. My ID is important only if
multiple slaves are present on the set Network.
Use the Numeric keys to input a unique ID for this
3750CS, then push ENTER.
11) Push the UP key to the “ENERGY” menu. The
numeric display indicates the current energy level, 1
equals High Power, 0 indicates Low power.
12) Press the 0 or 1 key as needed.
MSI recommends using high power (1) in most
installations.
13) This completes the MODEM setup. Push the EXIT
key to return to normal scale operation.
14) If the 3750CS is reporting “NO TARGET” it may be
necessary to send the “Talk to me” message. Do this
by pushing the MODEM key (usually F1).
1
2 MODEM
3 RF NTWK
4 1_
NEW N/W
4 12
5 FINDING
5 RF NTWK
6 C/S ID
7 7_
7 75_
8 C/S ID
9 MY ID
10 Enter ID for this 3750CS
10 NEW ID
11 1
ENERGY
12
13
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CONFIGURING FOR MULTIPLE NETWORKS
The 3750CS can access multiple CellScales by switching Networks. By programming a Function key to “RF
NETWK” a double push of the key will change the network allowing the 3750CS to monitor and control
different scales. Because each CellScale has both a network and a C/S ID, these must be set up with the “SETUP
RF NETWORK” menu. The 3750CS can access up to 5 CellScale based Networks. It takes the 3750CS from 4
to 7 seconds to switch networks, as it has to sync with a new hopping pattern.
1
2 RF NTWK
3 NET 1
4 0_-
NEW NTWK
4 02-
NEW CSID
5 02-1_
NEW CSID
5 02-12_
NEW CSID
6 02-012
NET 1
7 NET 2
8
1) Push SETUP.
2) Push the RF NET key (usually F2). The display
enters the Setup RF NETWORK mode.
3) Push ENTER. The first menu item is “NET 1”.
The numeric digits indicate the current network
/ CS ID pair.
4) Change the Network number by pushing the numeric
keys. Available network numbers range from 0-31.
In this example we’ll use network 02. Use the appropriate numbers for your
CellScale master. You must enter a leading ‘0’ for networks below 10.
Push the 0 key followed by the 2 key.
5) Use the numeric keys to change the C/S ID number
to match the C/S ID of the CellScale master.
Available C/S ID numbers range from 0-254.
In this example we’ll use C/S ID 12. The second half of the 5 digit entry
does not need leading zeros put in.
Push the 1 key followed by the 2 key.
6) Push the ENTER key to set the RF Network entry
for NET 1.
7) Use the UP key to scroll to the next needed NET x.
Repeat steps 3-5 to enter more Network addresses.
Up to 5 addresses can be programmed.
The 3750CS uses 55-555 as a place keeper for empty NET addresses.
8) Push the EXIT key after all needed RF Networks
are set up.
Set Up Multiple Networks
This procedure assumes F2 has been configured to the function “RF NETWK”.
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INTERPRETING THE RF BAR GRAPH
The RF Bar Graph is a useful tool for displaying the state of communications between the 3750CS and the
master CellScale. Referring to the illustration, the far left Tick (1) indicates the internal Modem is connected. The
second tick (2) indicates that the Display processor has successful serial communications with the RF Modem
processor. The third tick (3), when lit, indicates that a master CellScale is detected and the 3750CS has sync’d
up. All additional bar segments indicate transmission and reception of usable packets. It is not necessary that the
bar graph is full for communications to be successful. The bar graph will often change state while in setup menus
because the 3750CS is busy and not requiring data packets sent or received.
TROUBLESHOOTING RF CONNECTION PROBLEMS
Most connection problems are caused by improperly set up RF Networks. Both the 3750CS and the master
CellScale unit must have identical Network numbers. In addition, the CS ID must match on both units. If the
Net-ID of the CellScale is in question, you might have to connect a terminal to the CellScale to determine its
exact NET-ID. See the CellScale manual for this procedure. Verify the 3750CS settings are proper by using
the “CONFIGURE RF MODEM” procedure.
3 Segments of the Bar Graph are showing, the message reads “NO NETWK”
Use the Bar Graph as described above to get some indication of RF problems. If the rst 3 left most segments
are on, a Master CellScale is detected. The absence of additional segments indicates that the CellScale
and 3750CS are not conversing. Pushing the MODEM key (usually F1) will send a “Talk to me” message
to the master CellScale. If this fails to initiate conversation, recheck your C/S ID numbers and make sure
they match. Also, if there are additional 3750CS units set to the same network, they must have different
Slave IDs (see “MY ID”).
Another common cause of perceived problems is the “Phantom Network”. This occurs when there is a conicting
Network within broadcast range. Multi-CellScale sites must be planned carefully so that there are never two
master CellScales on the same Network number within range of each other. Since the CellScale can broadcast for
miles with good LOS (line of sight) conditions, this consideration is very important. If you suspect your 3750CS
has locked on to a distant (Phantom) network, try switching both the master CellScale and the 3750CS slave to
another unused Network. MSI advises avoiding Network #0 when possible, as this is the Modem default, and
therefore most likely to be found on units not properly set up.
Weight displays, but 3750CS keys don’t work
This is a result of changing the C/S ID in the slave 3750CS so it no longer matches the master CellScale.
The modem is still registered by the master CellScale, but control codes are not received because the master
assumes the codes are intended for a different slave CellScale. Change the C/S ID in the 3750CS back to the
number that matches the master CellScale.
Unit goes in and out of communication
This is usually a result of being in or near an “RF Null” zone. Because of multiple echoes of signals there is
sometimes locations that are particularly problematic even for Frequency Hoppers. Usually moving the antenna
location even a small distance can clear up this kind of problem. Avoid placing the antenna up against large
metal walls. The antenna should be at least 4 inches away from large metal surfaces. When close to a wall, this
has the effect of making the Antenna directional.
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Range is Inadequate
Antenna placement is the most common cause of poor range. Check that the RF power level of the master
and slave units is on “High”. Radio signals in nearby bands that have signicant power can also reduce range.
Longest range will always be achieved by Line-of-sight antenna placement. Any obstacle that interferes with
LOS will reduce the range. Particularly bad blocking is caused by metal buildings, solid concrete walls, and
anything else that has fairly high electrical conductance. Raising the antennas higher can help. Sometimes just
moving the antennas sideways will nd an RF “path” that will improve distance. The CellScale can sometimes
take advantage of reecting surfaces to get around obstacles. Antennas should always be place in vertical
polarization, that is the shaft of the antenna should be perpendicular to the earth, not parallel. It is OK to mount
the Antenna upside down. This is a good solution when an antenna is mounted on the ceiling for communication
with CellScale components in the building.
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SECTION 3 – SCALE OPERATION
POWER
Turns the Weight Indicator On and Off.
To Turn On the Power
1
2
If the system fails to connect in 10 seconds or less, push the
MODEM key to send a “Talk-to-me” message. If this fails check
RF network setups, or decrease the range between the CellScale
and the 3750CS..
1) Push POWER. The system performs a display
check: All segments and the Set Point / Total
LED’s illuminate for 3 seconds, then turn off for
1/2 second.
2) The LCD displays “3750 CS” and the software
version number.
3) Next the RF network is contacted. If the network is
functional, the display reads “WAIT” then displays
the current weight. This usually takes 4-6 seconds.
MULTIPLE SCALE CHANNELS
Each CellScale is capable of hosting up to 32 independent scale inputs. Since any 3750CS can communicate with
any CellScale, theoretically hundreds of scales can be controlled by a single 3750CS.
Because of the complexities of multiple channel setups, the 3750CS is designed to access channels that have been
previously setup in the CellScale through its terminal interface or virtual meter interface.
Channels in the CellScale are organized by A/D input channel followed by Mux sub channel value. The
standard CellScale has 2 A/D inputs, but can be ordered with 4 A/D inputs with the addition of a second
A/D Converter module. Each A/D channel can be further divided by the use of external multiplexers into
8 additional inputs per channel, providing a total of up to 32 independent scale inputs. The channels are
designated like this:
Channel (A/D 1-4) > 1-1 < Sub channel (mux 1-8)
The channel will vary from 1-4 and the sub channel from 1-8. In addition the CellScale provides channel 5
for slave CellScales, and channel 6 for math channels which allow the user to add or subtract channels from
each other or perform other math manipulations of the data. All calibration data for the 32 channels is stored in
the CellScale and is independent of the 3750CS. Therefore any 3750CS can receive calibrated data from any
CellScale provided the RF network is set up properly.
It should be noted that sub channels are useful even when the multiplexer option is not used. For example,
channel 1-1 could be calibrated as a 1000 x 0.5 kg scale, and channel 1-2 as a 2000 x 1 kg scale, making a
dual range platform (of course this assumes the platform is capable of handling 2000 kg). This will work as
long as the main channel remains constant. So, in theory, 1 platform could be calibrated as 8 independent
scales. This works because the CellScale does not know or care if a Multiplexer is actually present. It treats
the input as a separate scale.
The 3750CS is unable to read the channels directly. It reads multiple channels by using the Scan list index.
The “Scan list” is stored in the CellScale, with up to 32 channels present in the list. The rst number in the
scan list is called the Scan List Index number. The CellScale can have up to 32 Scan List indices. A scan
list can include “Math Channels” which provide a means to add digitally the results of multiple scales. For
example a scan list could look like this:
1= 1-1
2= 1-2
3= 1-3
4= 1-4
5= 6-1 Channel 6-1 defined as (CH1-1)+(CH1-2)
6= 6-2 Channel 6-2 defined as (CH1-3)+(CH1-4)
7= 6-3 Channel 6-3 defined as (CH1-1)+(CH1-2)+(CH1-3)+(CH1-4)
This scan list could be used with a wheel weighing system. The rst 4 channels are connected through a CellScale
Page 16 MSI-3750CS RF Weighmeter • User Guide
3750CS CELLSCALE RF DIGITAL WEIGHT INDICATOR
®
Push ZERO. The weight reading must be stable
within ±1 division for the zero function to work.
The display temporarily reads “ZEROED” and the
digits display 0. The backup memory stores the zero
reading, and can restore it even if power fails.
Final: The numeric digits display “0” (or 0.0 or
0.00, etc.).
ZEROED
1) Push the SC INDEX key (F3 in this example). The
message “SC INDEX” appears, and the numeric
digits indicate the current SC Index # (1-32).
2) Within three seconds, push either the SC INDEX
key again or the UP scroll key. The Scale Channel
will index to the next channel in the list.
To go to the previous channel in the list, push the DOWN scroll key
within 3 seconds of the SC INDEX key. (This won’t work if you used
F2 for the SC INDEX key)
3) Either wait three seconds for normal display func-
tion to return, or you can push ENTER or EXIT
to hasten return to standard scale function, now
operating on a new scale channel.
.01
1 SC INDEX
.02
2 SC INDEX
3 or wait 3 seconds.
Multiplexer and provide individual wheel loads. Index position 5 shows front axle load, index 6 shows rear axle
load, and index 7 shows total weight. The CellScale allows the user to name each channel and the name can
appear on the message (lower) display of the 3750CS. When dealing with multiple channels it is recommended
that you program the lower display mode to either display the scale channel number (LC NUMBR), the Scan
List Index number (SC INDEX), or the channel name (LC NAME).
See the “METER SETUP” section 7 to configure the lower display mode.
For more information on Scan Lists and dealing with multiple channels, please refer to the CellScale manual.
TO ACCESS MULTIPLE CHANNELS
As mentioned above, the 3750CS will access any channels setup in the CellScale. It does this with the “SC
INDEX” function. The SC INDEX steps from channel to channel as dictated by the Scan list stored in the
CellScale. If the CellScale has only one scale channel dened, this procedure is not necessary. This is always
the case for MSI-6260CS Crane Scales and other single load cell systems.
For systems with multiple scales attached to any given CellScale the setup procedure is:
1) Program the CellScale Scan List as required (see the CellScale Manual).
2) Program a function key for “SC INDEX” (see section 4 – FUNCTION KEYS).
3) Optional but recommended so you can readily identify which scale you are monitoring and controlling
– Program the lower display mode for “LC NUMBER”, “SC INDEX”, or “LC NAME” (see section
7 – METER SETUP).
To Change Scale Channel
This example assumes F3 has been setup for “SC INDEX”.
ZERO
Sets the zero reading of the scale. Use the zero key to take out small deviations in zero when the scale is
unloaded. (See “TARE SET” for zeroing (Taring) package or pallet weights)
To Zero
Rules for Use:
1) Works in GROSS mode or NET mode. Zeroing while in Net mode will zero the gross weight causing the
display to show the negative Tare value.
2) The scale must be stable. The scale will not zero if the motion detect annunciator is on.
3) The scale will accept a zero setting over the full Range of the scale (NTEP and other Legal-for-trade models
may have a limited zero range). Zero settings above 4% of full scale will subtract from the overall capacity
of the scale. For example if you zero out 100 lb. on a 1000 lb. scale the overall capacity of the scale will
reduce to 900 lb. plus the allowed over-range amount.
MSI-9000 CellScale® System • 3750CS User Guide Page 17
MEASUREMENT SYSTEMS INTERNATIONAL
Software V1-15 to 1-20
SETUP ZERO
In some applications it is desirable to have the scale return to a number other than zero. This is used in safety
applications where the weight of the scale itself must be taken into account, showing all weight hanging on a
crane. This feature may be disabled in Legal-for-trade units.
To Apply a Zero Offset
1
2 SET ZERO
3 WEIGHT
4 6_
4 60
5 SET ZERO
6
1) Push SETUP.
2) Push the ZERO key. The display enters the Setup
ZERO mode.
3) Push ENTER. The current Zero offset value is
displayed.
4) Use the numeric keys to change the zero offset
as desired.
In this example, we’ll enter 60 kg as a zero offset.
5) Push ENTER to set your Zero offset value into
memory.
This is the number the scale will display after you push Zero.
6) Push the EXIT key to return to normal scale
operation.
TARE
Tare is typically used to zero out a known weight such as a packing container or pallet and display the load in
NET weight. A Tare value is entered in one of three ways:
1) AUTO TARE – When the TARE key is pushed twice, the current weight is zeroed and Net Weight
is displayed.
2) KEYBOARD TARE – Using the numeric keys, the operator keys in the desired Tare Weight then pushes
the ENTER Key.
3) TARE UP/DOWN – Using the Scroll Keys, the Tare value is changed one scale division at a time. TARE
UP/DOWN is useful for increasing or decreasing the current Tare value slightly. The Keyboard Tare and
Tare Up/Down modes can be disabled through the use of SETUP TARE. In the “AUTO” mode a single
push of the TARE key will enact AUTO TARE.
To Auto Tare
1
2
1) Push TARE. The current Tare value is displayed.
If the TARE key is setup for “AUTO” only one push of the TARE key will be
necessary.
2) Push TARE again. Assuming no motion, the display
temporarily reads “TARE SET” and then converts
to a “NET” display. All following readings are
deviations from the set Tare value.
Page 18 MSI-3750CS RF Weighmeter • User Guide
3750CS CELLSCALE RF DIGITAL WEIGHT INDICATOR
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To Use Tare Up/Down
(TARE key function must be set to “KBD/UPDN”)
To Read the Tare Value
(without changing it) TARE key function must be set to “KBD/UPDN”.
1
1
2 CLEARING
1) Push TARE. The message display reads “TARE”
and the current Tare value appears on the numeric
digits for 2 seconds. Note or Print the value as
desired.
1) Push TARE followed by ` CLR (ZERO). The mes-
sage display reads “CLEARING”. The scale returns
to the GROSS mode.
Alternate method: Remove all weight from the scale (Gross Zero) and push
TARE. The message display temporarily reads “TARING”. Then the scale
returns to the GROSS mode.
To Clear Tare and Revert to Net Mode
To Keyboard Tare
(TARE key function must be set to “KBD/UPDN”)
1
2
3
4
1
2
2
3
1) Push TARE. The display reads “TARE”. Any current
Tare value is displayed.
You have only three seconds to start step 2.
2) Using the numeric keys input the value desired. In
this example we’ll use 0.5 lb. as a Tare Value.
The 3750CS will automatically place a leading zero if the Tare value starts
with the decimal point.
3) The Tare Value “0.5” is displayed.
4) Push ENTER to place the value in the Tare Register.
The display reads “TARE SET” and displays the
Tare value for 1 second. All subsequent readings
have the Tare value subtracted and are displayed
in “NET” weight.
1) Push TARE. The display reads “TARE”. Any current
Tare value is displayed. In this example a value of
9.5 lb. was previously Tared.
2) Within 2 seconds after pushing the TARE key,
use the UP or DOWN scroll keys to increment or
decrement the Tare value. Each single push of the
scroll keys will change the current Tare value 1
scale division. In this example, the scale increment
is .5 lb.
3) The Tare Value “10.5” is displayed. Push ENTER
to place the value in the Tare Register. The display
reads “TARING” followed by “TARE SET” and
displays the Tare value for 1 second. All subsequent
readings have the Tare value subtracted and are
displayed in “NET” weight.
MSI-9000 CellScale® System • 3750CS User Guide Page 19
MEASUREMENT SYSTEMS INTERNATIONAL
Software V1-15 to 1-20
Tare - Rules for Use:
1) Only positive gross weight readings can be tared. Weight can be tared in both the NET and GROSS modes.
When in the NET mode, the TARE is not cumulative, all the weight is zeroed.
2) The motion annunciator must be off. The weight reading must be stable.
3) Setting or changing the tare has no effect on the Gross zero setting.
4) Taring will reduce the apparent over range of the scale. For example, taring a 10 lb. container on a 60
lb. scale, the scale will overload at a net weight of 50 lb. (60-10) plus any additional allowed overload
(usually ~4% or 9d).
5) The scale stores the Tare value in the current ID Code memory until cleared. Each available ID Code
can store independent Tare values.
Multiple Tare Memories
The 3750CS is capable of storing Tare values through the use of the ID Codes. Each ID code stores an
independent Tare. See Section 3 “ID Codes” for more information.
SETUP TARE
Programs the TARE key mode (TAREMODE), the automatic TARE Clear function (AUTO CLR), and
the TAREALL function.
UNIV TAR
TAREMODE
1) AUTO – Only Auto Tare is in operation. Every time the TARE key is pushed, the current weight on
the scale is tared.
2) KBD/UPDN – In this mode, pushing the TARE key will enable the numeric keypad for Keyboard Tare
and the UP/DOWN scroll keys for TARE UP/DOWN. Also in this mode, pushing the TARE button a
second time will enact AUTO Tare.
UNIV TAR
The Universal Tare feature allows a single Tare value to be shared by all ID Codes. With UNIV TAR enabled
the individual Tares stored with each ID Code are ignored (but not erased). Disabling UNIV TAR will restore
the original Tare values. UNIV TAR is intended for those applications where a common carrier or pallet is used,
but multiple ID Codes are necessary for data collection.
AUTO CLR
Enabling “AUTO CLR” causes the 3750CS to clear the Tare Value after each lift greater than 0 NET. The
Tare Value is cleared and the display mode reverts to Gross Weight once the load is removed (the weight goes
below 0 NET). The “ON TOTAL” setting clears the Tare Value after the load is totaled. The default for the
“AUTO CLR” function is “DISABLED” . When disabled, the Tare Value can only be cleared manually (see
“To Clear Tare and return to Gross Mode”.)
Page 20 MSI-3750CS RF Weighmeter • User Guide
3750CS CELLSCALE RF DIGITAL WEIGHT INDICATOR
®
To Setup the Tare Key Mode
To Enable Tare Auto Clear
1
2 TAREMODE
3 AUTO
4 KBD/UPDN
5 TAREMODE
6
1) Push SETUP.
2) Push TARE. The TAREMODE submenu is shown.
3) Push ENTER. The rst menu choice is the current
TARE key mode. In this example, the “AUTO”
mode is enabled. We’ll change the mode to “KBD/
UPDN”.
4) Push the UP key to change the Tare Key mode to
“KBD/UPDN”.
5) Push ENTER. The Scale returns to the SETUP
TARE menu.
6) Push EXIT to return to normal operation with the
TARE key function altered.
1
2 TAREMODE
3 TAREALL
3 AUTO CLR
4 DISABLED
5 ENABLED
6 AUTO CLR
7
1) Push SETUP.
2) Push TARE. The TAREMODE submenu is shown.
3) Push the UP scroll key to change the submenu to
“AUTO CLR”.
4) Push ENTER. The first selection is the current
AUTO CLR mode.
5) Push the UP key to change the AUTO CLR mode
to “ENABLED”.
6) Push ENTER. The AUTO CLR is now enabled and
the 3750CS is back in the SETUP TARE menu.
7) Push EXIT to return to normal scale operation (with
the AUTO CLEAR TARE function enabled).
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