Teledyne THCD-101 User manual

INSTRUCTION MANUAL
THCD-101
ISO 9001
CERTIFIED
www.teledyne-hi.com

181-122018_THCD-101 Instruction Manual Page 2 of 26
Manual Print History
The print history shown below lists the printing dates of all revisions created for this manual. The revision level
letter increases alphabetically as the manual undergoes subsequent updates. Each new revision includes a
revised copy of this print history page.
Revision A (Document Number 181-122018)................................................................................December 2018
Visit www.teledyne-hi.com for WEEE disposal guidance.
Description of Symbols and Messages used in this manual
WARNING: indicates a hazardous situation, which, if not avoided, could result in death or
serious injury. Do not proceed beyond a WARNING notice until the indicated conditions are
fully understood.
CAUTION: indicates a hazardous situation, which if not avoided, could result in minor or
moderate injury. Do not proceed beyond a CAUTION notice until the indicated conditions are
fully understood and met.
NOTICE: calls attention to a procedure or practice that if not correctly performed or adhered
to, could result in equipment damage, loss of data, or inaccurate data.
NOTE:is used for tips and other digressions.
Hastings Instruments reserves the right to change or modify the design of its equipment without any obligation
to provide notification of change or intent to change.

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Table of Contents
1. GENERAL INFORMATION .................................................................................................... 5
FEATURES .................................................................................................................. 6
SPECIFICATIONS ............................................................................................................ 6
ACCESSORIES ............................................................................................................... 7
1.3.1. Power Supplies................................................................................................... 7
1.3.2. Cables ............................................................................................................. 7
2. INSTALLATION AND SETUP ................................................................................................. 8
RECEIVING INSPECTION ..................................................................................................... 8
MECHANICAL CONNECTIONS ................................................................................................ 8
2.2.1. Mounting .......................................................................................................... 8
ELECTRICAL CONNECTIONS ................................................................................................. 9
2.3.1. Transducer socket Pinout – 15 Pin 'D' Connector........................................................... 9
2.3.2. Interface Socket Pinout – 15 Pin HD 'D' Connector ...................................................... 10
2.3.3. USB Connector – USB Type-C ................................................................................ 10
2.3.4. Power Input Jack .............................................................................................. 10
3. OPERATION .................................................................................................................. 11
FEATURES ................................................................................................................ 11
3.1.1. Analog Input.................................................................................................... 11
3.1.2. Setpoint Control............................................................................................... 11
3.1.3. User Rezero..................................................................................................... 11
3.1.4. Adaptive Filtering............................................................................................. 12
3.1.5. Analog Output ................................................................................................. 12
3.1.6. Alarm Relays ................................................................................................... 12
FRONT PANEL INTERFACE ................................................................................................ 12
4. REMOTE COMMUNICATIONS .............................................................................................. 16
WEBSERVER .............................................................................................................. 16
4.1.1. Main page ....................................................................................................... 16
4.1.2. Live data ........................................................................................................ 16
4.1.3. Channel Configuration page................................................................................. 16
4.1.4. Control Configuration page ................................................................................. 17
SERIAL &TCP COMMUNICATION ..................................................................................... 17
4.2.1. Introduction .................................................................................................... 17
4.2.2. Command/Query format..................................................................................... 18
4.2.3. Main commands................................................................................................ 18
4.2.4. Communication commands .................................................................................. 20
4.2.5. Channel Setup commands.................................................................................... 20
4.2.6. Filtering commands ........................................................................................... 21

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4.2.7. Relay control commands ..................................................................................... 21
4.2.8. Other commands .............................................................................................. 21
4.2.1. Command Set Summary ...................................................................................... 22
5. TROUBLESHOOTING ....................................................................................................... 24
AUTHORIZED MAINTENANCE .............................................................................................. 24
TROUBLESHOOTING ...................................................................................................... 24
5.2.1. Instrument Lists and Codes.................................................................................. 24
5.2.2. Possible Problems and Solutions............................................................................ 24
6. WARRANTY .................................................................................................................. 25
WARRANTY POLICY....................................................................................................... 25
RETURN POLICY .......................................................................................................... 25
7. DRAWINGS ................................................................................................................... 26

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1. General Information
The THCD-101 is a multi-featured process display controller, capable of interfacing directly to a mass flow
meter, mass flow controller or another process transducer such as the HVG-2020 Vacuum Transducer. The
THCD-101 is a single channel unit which can be used to power a bipolar (±15Vdc @ 300mA) or unipolar (24Vdc @
400mA) device. The THCD-101 can display the output from a transducer that supplies voltage signals up to 10
VDC or 4 – 20 mA current signals. There is also an input that can be used for external command (setpoint)
control (+10Vdc full scale). Digital interfaces to the THCD-100 include USB (Serial Port Emulation) and
Ethernet.
Hastings vacuum instruments do not require any periodic maintenance under normal operating conditions with
clean gases. No damage will occur from the use of moderate overpressures (< 25 psig).
The following sections contain the steps needed to get a new power supply operating as quickly and easily as
possible. Please read the following thoroughly before attempting to install the instrument.
NOTICE:The instruments described in this manual may be available with multiple pin-outs.
Ensure that all electrical connections are correct.
NOTICE:The instruments described in this manual are designed for INDOOR use only.
NOTICE:The instruments described in this manual are designed for Class 2 installations in
accordance with IPC standards.
CAUTION: There are no operator serviceable parts or adjustments inside the product.
CAUTION: If this equipment is used in a manner other than that specified, the protection
provided by the equipment may be impaired.

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Features
± (0.02% Reading + 0.01% FS) Accuracy.The displayed valued is a highly accurate representation of the
analog input value.
0-5 Vdc, 0-10 Vdc Set Point Via Front Panel Or Digitally (USB/Ethernet). The desired control setpoint can be
set locally or via a remote computer.
Dual Programmable Alarms with Relays.The THCD-101 provides two double throw relays with 2A (@30 Vdc)
switching capacity and 220Vdc max switching voltage.
USB, Ethernet and Analog Output (Standard). The THCD-101 has multiple ways to provide the user with a
remote indication of the controlled parameter.
6 Digit Graphical Display.The display provided with THCD-101 can provide the user simultaneous indications
of the magnitude of the controlled parameter, unit of measure, valve over-ride status and alarm status.
Specifications
WARNING: Do not operate instruments exceeding the specifications listed below. Failure to
heed this warning could result in serious personal injury and/or damage to the equipment.
Display Range: 6-digit value including decimal point, 99999 max value
Analog Input -10.8 Vdc →+10.8 Vdc, Input Impedance > 100 kΩ
Measurement Accuracy: ±(0.02% Reading + 0.01% FS)
Setpoint Output 0 – 10 Vdc, Accuracy ±(0.03% Reading + 0.01% FS)
Operating Temperature:5°C to 60°C
Humidity: max 90 %RH @ 50°C, non-condensing
Power Requirements: 24 VDC ±5%, 600 mA minimum
Class 2 power 150 VA max fused
NOTICE: Use of an underpowered or under-voltage supply could result in equipment damage.
CE Mark EN55011, EN61326, EN61010
RoHS Compliant YES
Weight (approx.): 0.44 lb. (0.2 kg)
Dual Alarm Relays: 2A (@30 Vdc) switching capacity and 220Vdc max switching voltage
Connectors: 2.1 x 5.5mm bayonet-style power jack (power)
15-pin “D” connector (Transducer connection)
15-pin high density “D” connector (Relay connections)
USB type-C (virtual COM port for serial communications)
RJ45 (Ethernet communications)

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Accessories
1.3.1. Power Supplies
Hastings offers power supplies that convert 100, 115 or 230VAC to the 24Vdc voltage required to
operate the THCD-101 and have a circular power plug that will mate with the power jack on the back
of the THCD-101. 24VDC power supply (P/N 12-01-169).
1.3.2. Cables
Hastings offers interface cables to connect the THCD-101 up to Hastings 200/300 series flow
instruments with the standard 15 pin D Connector or the 9 pin D connector used on the 24 Volt versions
as well as the HVG-2020 series of vacuum gauges
±15 Vdc Flow Instruments – 15 pin D connector (std H Pinout)
Stock# Length
65-431 18 inches
65-576 4 feet
65-149 8 feet
65-148 25 feet
65-160 50 feet
65-193 100 feet
65-576-SPECIAL Custom Length cable
±15 Vdc Flow Instruments – 15 pin D connector (U Pinout)
Stock# Length
65-791 8 feet
65-791-99 Custom Length cable
24 Vdc Flow Instruments (includes D300B series) –9 pin D connector
Stock# Length
CB-AF-8-24VM 8 feet
CB-AF-xxx-24VM Custom Length cable
IP-67 Digital Flow Instruments – 12 pin Circular connector
Stock# Length
CB-12PCF-8-AM 8 feet
CB-12PCF-XXX-AM Custom Length cable
HVG-2020 – 9 pin D connector
Stock# Length
CB-AF-8-HVG9M 8 feet
CB-AF-xxx-HVG9M Custom Length cable
Digital AVC – 15 pin High Density D connector
Stock# Length
CB-DAVC-8-AM 8 feet
CB-DAVC-XXX-AM Custom Length cable
More information about the power supplies and cables can be found on the Hastings web site:
http://www.teledyne-hi.com

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2. Installation and Setup
This section contains the necessary steps to assist in getting a new vacuum gauge into operation as quickly and
easily as possible. Please read the following thoroughly before attempting to install the instrument.
Receiving Inspection
Prior to opening, inspect for obvious signs of damage to the shipment. Immediately advise the carrier who
delivered the shipment if any damage is suspected. If the shipment has arrived intact, carefully unpack the
gauge and any accessories that have been ordered. Check each component shipped with the packing list.
Ensure that all parts are present (i.e. gauge, power supply, cables, etc.). Optional equipment or accessories
will be listed separately on the packing list.
Mechanical Connections
2.2.1. Mounting
NOTICE: The THCD-101 should be installed in a clean and careful manner. Take care not to drop the
product and avoid impacts to prevent damage.
The THCD-100 can be panel mounted, or used on a bench top and is a standard 96 x 48mm panel meter
enclosure. Note that the instrument must always be situated in such a way as to enable adequate air
circulation about the unit. If a transducer was supplied with the THCD-101, a suitable cable may have been
included.
A panel mount kit will have been supplied with the instrument. This consists of two screws (M3x6), two
brackets and two screws (50mm). Fit the M3x6 screws into the side of the unit into the diagonally opposed
holes. Do not tighten these screws, to allow the bracket to slide over the screw head. Thread locking adhesive
may be used but is not required, as these screws cannot rotate once the bracket is tightened. Insert the meter
into the panel. A cutout of 3.63” x 1.84” (92 x 45mm) is recommended. Slip the mounting bracket over the
screw head and tighten the 50mm screws. The unit should now be secure.

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Electrical Connections
2.3.1. Transducer socket Pinout – 15 Pin 'D' Connector
Pin Number
Designation
5
Signal Common
6 Signal In (Vdc, mA)
7
Case Gnd
9 -15 VDC
11 +15 VDC
12
Valve Return
13 +24 VDC
14
Set Point Out (VDC)
All other pins Not Connected
If the transducer is being powered from another source (e.g. a mains powered supply), it will only be necessary
to connect to the two signal pins. Note: The THCD-100 has a floating differential input. For single ended use
(i.e. transducers with differential output) join 0V (pin5) & Signal Return (pin12) at the transducer. Ensure the
common mode input range is not exceeded.

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2.3.2. Interface Socket Pinout – 15 Pin HD 'D' Connector
Pin Number
Designation
1
Analog Output
2 Relay 2 Common
3
Relay 2 Normally Open contact
4 Relay 2 Normally Closed contact
5
0V (Signal Ground)
6
External Setpoint Return
7 N/C
8
External Setpoint
9 N/C
10
0V (Signal Common)
11
TTL Input – Disable Menu
12 TTL Input – Disable Zero
13
Relay 1 Common
14
Relay 1 Normally Open contact
15
Relay 1 Normally Closed contact
2.3.3. USB Connector – USB Type-C
The Serial connector supports USB-C 2.0 cables without the SuperSpeed pairs. Therefore connecting a fully
featured USB-C 3.1 cable will not provide SuperSpeed functionality, although the cable will still work as per
the USB 2.0 specification. When connected via the USB port, the THCD-101 will emulate a standard serial port.
The fixed baud rate is 57600 with other settings as follows: 8 data bits, 1 stop bit, No parity, No handshaking.
2.3.4. Power Input Jack
The panel meter display requires a 24Vdc ± 5%, 600mA supply to operate. This must be a rectified and
regulated direct current supply capable of supplying at least 1.1 Amp during the turn on surge. Although the
THCD-101 has an internal fuse and power supply overload shutdown protection, the supply to the THCD-101
should be protected by fuse or other suitable electronic method.
For convenience, Hastings offers a compatible supply (12-01-169) that, when matched with the US (12-01-160),
Euro (12-01-164) or the UK (12-01-165) plug adapters, converts wall power to specified levels
A standard 5mm diameter ‘dc power jack’ is required to connect to the THCD-101.
Connect the positive conductor to the center pin. Connect the negative (0V) conductor to the outer of the
jack.
WARNING: Ensure correct power supply rating and polarity. Do not use a partially assembled
or faulty unit. Incorrect use of this equipment, or use in a manner not specified may impair
the user’s protection.

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3. Operation
Features
This section describes the principles used in the THCD-100. It details the various settings for the inputs and the
outputs including setpoint control. It does not detail any servicing or calibration procedures.
3.1.1. Analog Input
The analog input signal sent by the process sensor and received by the THCD-101 is scaled via front panel
controls to indicate a process value on the front panel in user selectable units. The user defines what the full-
scale process value is and what analog signal would be received from the sensor to indicate this full-scale
process value. The full-scale analog signal input value is configurable via front panel menu for any value from
0 to 10 Vdc (20 mA for 4 – 20 mA units). The THCD-101 will show the over-range error (“RANGE”) when the
analog input is more than 15% over the full-scale analog value.
The secondary input is used to accept an external command setpoint and has a non-configurable full scale of
10V. This input is used when the setpoint is set to the slave source.
3.1.2. Setpoint Control
The THCD-101 has an analog output that is used for command setpoint to control a mass flow controller or
similar device. The setpoint command output has a voltage full scale that matches the input channel
configuration.
Example - If the input channel is setup for a 100 slm, 5V full-scale device, and the setpoint value is 10.0 slm
(assuming setpoint is in Auto mode and not a slave source), then the output voltage of the setpoint would be
0.5V.
The setpoint does have some configuration parameters that can be used to alter the function of the setpoint
control and they are detailed as follows:
(a) Setpoint Mode - The setpoint can be configured in one of three modes – Auto, Open and Closed.
In Auto mode the setpoint output is dependent on the setpoint source and value settings (see below).
In Open mode the setpoint outputs a voltage greater than the full scale of the device. For a setpoint
command full scale of 5V or less, the output in this mode is 7V. For any other setpoint command full scale
(e.g. 10V), the output in this mode is 12V.
In Closed mode the setpoint outputs a voltage less than the minimum output voltage of most devices, the
setpoint output voltage is –0.25V.
(b) Setpoint Source - The setpoint source dictates where the setpoint value comes from, assuming the mode is
set to Auto (see above). This can be one of two possibilities – Internal or Slave.
Internal source –the setpoint uses the value set internally via the ‘▲’ & ‘▼’switches or via the
externals comms.
Slave source – in this case the setpoint uses a percentage of an externally produced value. The percentage
is set via the ‘▲’ & ‘▼’ switches and the external value comes from the secondary input channel (as
mentioned above)
3.1.3. User Rezero
Over time, it is possible that the input will ‘drift’ slightly due to various conditions (temperature changes,
etc.). As such, it may be necessary for the channel to be re-zeroed by the user.
The user re-zero function is provided for this task. It simply takes the current reading (sampled and averaged
over 3 seconds) and uses that as an additional offset for the channel in question, subtracting the value from all

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subsequent readings. Ensure any process value to be zeroed, is in fact truly zero before performing this
function. This would mean isolating flow devices or fully pumping a pressure device.
Note that the user communicating with the THCD-101 unit remotely using the USB or Ethernet communication
ports can also clear a previously entered user re-zero value. This should be used before any input calibration is
performed to ensure that the calculated calibration points are not distorted by the user zero offset.
3.1.4. Adaptive Filtering
The THCD-101100 includes an adaptive averaging filter on the display and remote communication readings to
aid in ‘smoothing out’ unwanted ‘noise’ on the displayed readings.
(a) Operational band
The filter can be configured to filter values that are within a certain band, meaning that excursions between
subsequent readings that fall outside that band are shown as non-filtered readings. The band is configurable
between 0.01% and 1.00% of the full-scale range of the input channel. The filter can be set to OFF, which
means that no filtering is performed and can be set to ON which means that filtered value is always shown, no
matter how big of an excursion occurs.
(b) Filter size
The size of the filter is currently configurable between 0 and 6 seconds and simply indicates the amount of
readings that are taken and buffered to calculate and show the averaged reading. A filter size of 0 will
naturally turn off the filtering, irrespective of the band setting. If the buffer size is greater than 5 seconds,
filter is turned ON, meaning that filtered data will always be shown.
3.1.5. Analog Output
The analog process measurement input value received from the attached sensor is retransmitted to the user
and available on the Interface Socket. This output can be used for data logging purposes or for providing an
external setpoint control to another THCD-101 or similar instrument.
3.1.6. Alarm Relays
The THCD-101 has two internal alarm relays. Each relay has Common, Normally Open, and Normally Closed
contact connections available on the Interface Socket. Each relay will switch positions when the displayed
process variable changes from below the previously set Trip Point value to above the Trip Point + the Hysteresis
value. The relay will change back when the process value drops below the Trip Point – the Hysteresis value.
Front Panel Interface
(a) Main Screen (not changing Setpoint)
The main screen shows the main channel
input data (with range, full-scale and
calibration applied) and the associated
units string. If an input is over range (more
than 15% above full-scale voltage) then the
data value is replaced with the over range
error – “RANGE”. This screen also shows the
current mode of the setpoint, if not in
AUTO (i.e. OPEN or CLOSE). If either of the
relays have been tripped then they are also
indicated as such on the far right of the
screen.
Switch Functions:

181-122018_THCD-101 Instruction Manual Page 13 of 26
Func No function
◄Go to Main Menu screen
►Enable setpoint mode override, active for 2 seconds
►(override mode) Change setpoint mode to AUTO
▲Change setpoint value (main screen changes as below)
▲(override mode) Change setpoint mode to OPEN
▼Change setpoint value (main screen changes as below)
▼(override mode) Change setpoint mode to CLOSE
Zero Perform input rezero (if held for 3 seconds)
(b) Main Screen (changing Setpoint)
When performing a setpoint change, the main screen is as previously, but with the addition of the current
setpoint value (initiated via an initial press of the ‘▲’ or‘▼’ switches). Note that the setpoint value is
not permanent –if the ‘▲’ or ‘▼’switches are not pressed at all for 3 seconds, then the setpoint value
disappears.
(c) Main Screen (Setpoint Valve Control)
Rather than commanding the setpoint to a specific value, the setpoint mode can be changed to Open or Closed
which overrides any previously set value. Again the main screen shows everything as normal, but with the
addition of the OPEN or CLOSE identifier if this mode has been set. By putting the device into override mode it
is possible to force the setpoint to be Open or Closed. This is done by pressing the override switch then the
appropriate mode switch. Either mode can be cancelled by switching back to Auto mode (by effectively
pressing the override switch twice).
(d) Main Menu Screen
The Main Menu screen allows the user to select screens
that are used for the configuration of the THCD-101 – the
setpoint (initial value, initial mode, source), input (range,
full scale, units string), comms, filtering and relays can all
be configured from screens selected via the main menu. It
is also possible to reset settings to their factory defaults
from the Main Menu screen. Only 4 options can be shown on
the screen at any one time, so the menu list scrolls up until
the last item is shown, and then the selection arrows move
down to allow for selection of any menu item.
Switch Functions:
Func Go back to Main screen
◄No function
►No function
▲Go to previous menu selection
▼Go to next menu selection
Zero Go to screen associated with menu selection
(e) Setpoint Screen
From the setpoint screen you can edit the value of the command setpoint as well as change the mode (AUTO,
OPEN, CLOSED) and the source (INTERNAL, SLAVE). If SLAVE is selected then the percentage sign (%) appears
next to the SP value. For more information on the command setpoint, see the Principles section - 7.4.
Switch Functions:
Func Go back to Main Menu screen
◄Select previous character when in edit mode
►Select next character when in edit mode
▲Move edit field selection up
▼Move edit field selection down
Zero Go to edit mode for currently selected field

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(f) Input Screen
This screen allows you to change the input channel range
and full-scale voltage and assign a units label (up to 5
characters) for the channel data. The number of decimal
places selected on the range field dictates the number of
decimal places shown for the input channel data on the
Main screen. To reduce the number of decimal places,
change the number under the edit cursor to a decimal
point and the system will auto format the field when
‘Zero’ is pressed.
Switch Functions:
Func Go back to Main Menu screen
◄Select previous character when in edit mode
►Select next character when in edit mode
▲Move edit field selection up
▼Move edit field selection down
Zero Go to edit mode for currently selected field
(g) Comms Screen (IP Address input)
The IP address and the subnet mask of the device can be
changed here. The device will need to be reset to enact
these changes.
A fixed IP address must be used. DHCP is not an available
option. The THCP-101 must be on the same subnet as
the computer used to communicate with it since it does
not use a Gateway. The chosen fixed IP address must be
protected from use by the DHCP\DNS server that is
probably used to issue the IP addresses for the computer
network or communication failure will occur at some point.
Switch Functions:
Func Go back to Comms Menu screen
◄Go to previous menu selection
►Go to next menu selection
▲No function
▼No function
Zero Go to screen associated with menu selection
(h) Filtering Screen
This screen allows the user to modify the band and buffer
size of the adaptive filter. The filter only applies to the
display and comms output readings. The band is
represented as a percentage of FS and can be set
between 0.00% (OFF) and 1.00% and also to ON. The
buffer size allows settings between 0 and 6 seconds of
filtering. For more information on the adaptive filter, see
the Principles section (7.6)
Switch Functions:
Func Go back to Main Menu screen
◄Select previous character when in edit mode
►Select next character when in edit mode

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▲Move edit field selection up
▼Move edit field selection down
Zero Go to edit mode for currently selected field
(i) Relay Screen
This screen allows you to set the trip point for when the
relays switch. The relays also contains some hysteresis to
stop them ‘chattering’. This is configurable from this
screen as well and is represented as a percentage of full
scale of the input channel, with limits of 0.0% (i.e. no
hysteresis) to 10.0%.
Switch Functions:
Func Go back to Main Menu screen
◄Select previous character when in edit mode
►Select next character when in edit mode
▲Move edit field selection up
▼Move edit field selection down
Zero Go to edit mode for currently selected field
(j) Factory Defaults Confirmation Screen
If Factory Defaults is selected from the Main Menu, this screen appears to ask for confirmation of the requested
function. If confirmed then the screen changes to show a percentage of completion of the factory defaults and
once completed the THCD-101 will restart.
Switch Functions:
Func Go back to Main Menu screen
◄If held, starts factory default when Zero is pressed
►No function
▲No function
▼No function
Zero Starts factory default if ◄is held as well.

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4. Remote Communications
Webserver
4.1.1. Main page
The Web server can be used by entering the IP address of the device into a browser address bar. This allows
the user control of various settings within the device and to read the devices current reading. Along the top
are a series of tabs to allow the user to switch to various sections of device control. Also along the side is the
device serial number and controls to start streaming communications, note for TCP streaming to work a TCP
connection on port 101 must be pre-established (the unit does not data stream over the HTTP port (80)).
4.1.2. Live data
The live data page is the first page the user will see when the web server is loaded up. The main feature of this
page is the live data output from the device, but it also has the capabilities to rezero the channel, to change
the setpoint value and to set the setpoint valve position. Note: The setpoint is set in engineering units as
configured by the range setting and cannot be set to more than this range configuration.
The units string and device range can be changed from the Channel cfg page.
4.1.3. Channel Configuration page
The channel configuration contains channel setup options.
·Units string allows the user to change the units of the channel.
·Range is the Engineering unit conversion of the Voltage output from the transducer (e.g. in the image above
10 Volts = 100 mbar).
·The number of decimal places set for the range dictates its display precision
·Fullscale is the maximum Voltage output of the transducer.
·Source is where the setpoint is referenced from, Internal will output the number entered as the setpoint
value and Slave will output a percentage of the external input.
·Init value is the value to which the setpoint will be set to at start-up.
·Init mode is the valve position, auto is the normal setpoint mode, Open will set maximum range voltage
output and closed sets minimum range

181-122018_THCD-101 Instruction Manual Page 17 of 26
4.1.4. Control Configuration page
The control configuration page is made up of multiple
sections each controlling a different section of the device.
(a) Communication
The communication page allows the user to change the IP
address and Subnet mask of the device. Obviously no octet
in the IP Address or Subnet mask can be set to higher than
‘255’. Once applied the device will need to reset, so the
communications page will show a popup (see below) that
prompts the user to refresh.
(b) Relays
The Relays page allows the user to change the controls for
the two onboard relays.
The hysteresis is a window around the trip point at which
the relays will trigger, so to trigger the relay in the image
above the input must get to Trip point + 2% (of fullscale)
and the relay will not switch off until the input drops to
Trip point – 2% (of fullscale).
The trip point is the Engineering unit at which the Relay
will trip
(c) Filtering
Filtering is used to reduce noise in the device.
Band relates to the filtering limits. The setting is
percentage of fullscale and can be set between 0.01% and
1.00%. Other settings are On so that the filtering will be
fully active, filtering all data all the time, and Off where
there is no filtering.
The size is the time the data is filtered over, a time
greater than 5 will turn the filtering band to on
automatically. For more information on how the adaptive
filter works, see the Principles section (7.6)
Serial & TCP Communication
4.2.1. Introduction
The THCD-101 allows full control and feedback via TCP/IP and USB serial port emulation. All parameters that
can be set using the front panel are also available via remote communications or on the webserver and all
calibrations are performed using remote communication commands or the webserver.
The serial port has a fixed baud rate of 57600 with other settings as follows: 8 data bits, 1 stop bit, No parity,
No handshaking.
TCP/IP communication requires an IP address and subnet mask to be configured for the THCD-101. This can be
set via the front panel. Note that after changing the IP address or subnet mask, the THCD-101 must be re-
initialized by performing a system reset. This is done automatically if setting the IP values using remote
communications or the webserver, but if the IP values from the front panel, you must power off & on for the
new TCP/IP settings to come into effect.
Note for the host connection, the TCP port of the THCD-101 is port 101.

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4.2.2. Command/Query format
The format of the commands and queries is common between all available communication channels for ease of
use and understanding when switching communication methods:
Format: accc[?] [p][,p][,p]⏎
… where ‘a’ = address, ‘ccc’ = command/query, ‘?’ = query identification; ‘p’ = parameter (separated by
commas if more than one) and ⏎indicates a carriage return followed by a line feed.
The first letter to be entered on the command line, before any command or query, is the address identifier.
This is a legacy character and can no longer be configured. It is now fixed to the character ‘a’ but must be
present.
Most commands are identified by three letters (although this is not always the case) and a query is identified
by following the command letters with a ‘?’ character. For all commands with parameters, you must separate
the command from its parameters with a space, and separate multiple parameters with commas.
Table 1 in Appendix A summarizes all commands and queries available. Note that where a command is also a
query, you do not enter any parameters for the query ‘version’ unless explicitly stated in the table.
For everything sent on the communications port, the THCD-101 will reply by informing the user of the
command/query it has just received, along with any parameters identified, any data requested (if it was a
valid command/query) and a line indicating whether the command was accepted. This reply block is the same
for anything sent to the THCD-101 and is as follows.
(‘⏎’ indicates a carriage return/line feed pair):
For a command: For a query:
*<a>*:<cmd>;<params>⏎*<a>*:<cmd>;<params>⏎
!<a>!<response>!⏎<data>⏎
!<a>!<response>!⏎
where: <a> is the address letter
<cmd> is the command/query (query identified by a ‘?’ after the three chars)
<params> is the comma separated parameter list, if any
<response> is the acceptance indicator.
<data> is the data requested if a query was sent. Note the data usually consists of some identification string, in
CAPS, followed by a colon (:) and then the actual data. Some queries return multiple lines of information. See
individual commands for details as appropriate. Since many response include carriage return / line feed
characters in the middle of the response, the carriage return / line feed cannot be used to signal that the end
of the message has been reached. However the “!⏎” combination can be used to indicate message
termination.
The acceptance indicator is a single character as follows:
‘o’ = OK: if the command/query was recognized and accepted;
‘b’ = BADCMD: if the command/query was not recognized or has incorrect/invalid parameters
‘e’ = ERROR: if there was some internal communication error.
‘w’ = BUSY: if the communication channel is currently busy.
4.2.3. Main commands
(a) Output current readings – ‘r’
This command tells the THCD-101 to get the current reading of the input channel data and send it to the
communications channel. If the input voltage is more than 15% over the full scale voltage, the <reading> below
will be replaced with the over range error – “RANGE!”.
The readings output format is as follows with the channel data followed by a setpoint mode indication,
separated by a semi-colon:
READ:<reading>;<setpoint mode>⏎
The <setpoint mode> is a single number that represents the current mode of the setpoint: 0 = Auto, 1 = Open,
2 = Closed.

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(b) Output current readings repeatedly – ‘rp’
The THCD-101 is also able to report the current readings repeatedly, at a given interval. This command starts
and stops this repeat activity by setting the parameter accordingly:
0 = Repeat off
1 = Repeat every 100ms
2 = Repeat every 500ms
3 = Repeat every second
4 = Repeat every minute
The timing commences from the point at which the ‘rp’ command is entered. NOTE: when 100ms repeated
output is used, the data will be taken every 100ms and buffered up, to be sent out every 500ms in blocks of 5
readings. This has proven to be a more robust output method. For consistency, the output from USB port also
works in the same way.
(c) Setpoint value – ‘spv’
This command is used to set the value of the command setpoint. The command takes the setpoint value as the
parameter.
The current value of the setpoint can be retrieved using the query ‘spv?’. Returned data is:
SP VALUE: <setpoint value>
(d) Setpoint mode – ‘spm’
This command sets the mode for the command setpoint. The command takes anidentifying mode integer
between 0 & 2, as a parameter:
0 = Auto mode
1 = Open mode
2 = Closed mode
The current mode of the setpoint can be retrieved by using the query ‘spm?’. The returned data is:
SP MODE: (<x>) <mode string>
… where … <x> = 0, 1, or 2 and <mode string> = AUTO, OPEN, or CLOSED respectively.
(e) Setpoint source – ‘sps’
The setpoint source can be an internally set value or a percentage of the secondary THCD-101 input (known as
slave input). This source is set using this command and as with the other setpoint commands, it takes just one
parameter which is as follows:
0 = Internal source
1 = Slave source
The current source of the setpoint can be retrieved by using the query ‘sps?’. The returned data is:
SP SOURCE: (<x>) <source id>
…where… <x> = 0 or 1 as above, <source id> = string identifier for <x> : INTERNAL or SLAVE.
(f) Setpoint initial value – ‘siv’
The setpoint value set with the ‘spv’ command (above) is not non-volatile. This command can be used to set an
initial setpoint value on system startup. It takes one parameter which is the initial setpoint value.
The current value of the setpoint can be retrieved using the query ‘siv?’. Returned data is:
SP INIT VAL: <initial setpoint value>
(g) Setpoint initial mode – ‘sim’
As with the value, the setpoint mode set using the ‘spm’ command (above) is a volatile setting. Again this
command provides a way of setting an initial startup mode for the setpoint on power up of the THCD-101. It
takes one parameter which is a number between 0 & 2, identifying the initial mode, as follows:
0 = Auto mode

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1 = Open mode
2 = Closed mode
The current mode of the setpoint can be retrieved by using the query ‘spm?’. The returned data is:
SP INIT MODE: (<x>) <mode string>
… where … <x> = 0, 1, or 2 and <mode string> = AUTO, OPEN, or CLOSED respectively.
4.2.4. Communication commands
(a) Ethernet IP address – ‘eip’
This command changes the IP address used to communicate over TCP/IP. The parameter should be entered as a
standard 4 octet IP address. e.g. 192.168.1.180. The max octet value is 255. If a greater value is entered, that
value will be capped to 255. Once the THCD-101 has responded to the command, it will display the following
and autorestart the system.
UNIT SHOULD AUTO RESTART⏎
IF NOT, RESTART TO APPLY CHANGES⏎
This is necessary to re-initialise the internal TCP socket with the newly set IP address. To retrieve the current
IP address, use the query ‘eip?’. The returned data is:
IP ADDRESS: <xxx>.<xxx>.<xxx>.<xxx>
…where <xxx> is always a three digit octet.
(b) Ethernet subnet mask – ‘esm’
This command changes the Subnet mask used as part of the TCP/IP communication. As with the IP address, the
parameter should be entered as a standard 4 octet mask. e.g. 255.255.255.0. Each octet value is again capped
if a value greater than 255 is entered.
The THCD-101 will respond and the display the following before auto-restarting the system (as with the IP
address).
UNIT SHOULD AUTO RESTART⏎
IF NOT, RESTART TO APPLY CHANGES⏎
The current subnet mask can be retrieved using the query ‘esm?’. The returned data is:
SUBNET MASK: <xxx>.<xxx>.<xxx>.<xxx>
…where <xxx> is always a three digit octet.
4.2.5. Channel Setup commands
(a) Input channel units string – ‘uiu’
The input channel has an associated free-form text field that can be used to identify the units being used. This
command is used to set this and its only parameter is a max of 5 characters for the units string.
The current units string can be retrieved using the query ‘uiu?’. The data returned is as follows:
INPUT UNITS STR: <units>
… where… <units> = the exact units string as displayed on the front panel
(b) Input channel range – ‘uir’
Use this command to set the range of the input channel. The single parameter is the actual value for the
range. The number of decimal places passed in the range value dictates the number of decimal places shown
for the main data output (up to a max of 4 decimal places – any more will get chopped off)
The current range of the input channel is retrieved using the query ‘uir?’. The data returned is as follows:
INPUT RANGE: <range>
… where… <range> = the range of the channel (engineering units)