COMET SYSTEM T4311 Programmable Temperature Transducer Instruction Manual

: June 12, 2024
: COMET SYSTEM

COMET SYSTEM T4311 Programmable Temperature Transducer

Product Information

The T4311 and T4411 are programmable temperature transducers designed for use with RTD Pt1000 sensors. They feature serial output options of RS232 and RS485. These transducers are manufactured by COMET SYSTEM, s.r.o., based in Roznov pod Radhostem, Czech Republic.

Transducer Version TxxxxL

The TxxxxL version includes a watertight male connector instead of a cable gland for easy connection and disconnection of the communication cable. It utilizes a male Lumberg connector RSFM4 with an IP67 protection rating.

Transducer Version TxxxxZ

Models marked TxxxxZ are non-standard versions of the transducers. Please refer to a different manual for their description.

Manufacturer Settings

By default, the transducer is set to the following parameters:

Communication Protocol: Modbus RTU
Transducer Address: 0 1H
Communication Speed: 9600Bd, no parity, 2 stop bits switched ON
Display: Enabled

Product Usage Instructions

Transducer Installation

Use a shielded two-wire type external temperature probe.
Position the cable away from potential interference sources.
The maximum length of the probe cable should not exceed 10m.
Connect the probe cable shielding to the proper terminal and avoid connecting it to any other circuitry or grounding it.
If the connected probe has a metal stem, it is recommended to use probes with metal stems not connected to the cable shielding. Alternatively, ensure that the metal stem is not connected to any other circuitry.
Lead the cable in a straight line and avoid creating “tree” or “star” configurations. If necessary, terminate the network with a termination resistor. The recommended value for the resistor is around 120 Ω. For short distances, the termination resistor can be omitted.
Keep the cable separate from power cabling, maintaining a safe distance of up to 0.5 m to prevent interference signals.
The electrical system (wiring) should only be handled by qualified personnel following the required operation rules.

Transducer with RS232

Refer to Appendix B for the connection diagram.

Transducer with RS485

Refer to Appendix B for the connection diagram.

Info Mode

If you are unsure about the settings of the installed transducer, you can verify its address without using a computer:

Connect the power to the transducer.
Unscrew the transducer cover and briefly press the button next to the connection terminals (ensure that the jumper is open).
The actual adjusted address of the transducer will be displayed on the LCD display in decimal format. For HWg-Poseidon’s communication protocol, a number corresponding to the ASCII address code will be shown.
Pressing the button again will exit info mode and display the actual measured values.
Note: No measurement or communication is possible during info mode. If the transducer remains in info mode for more than 15 seconds, it will automatically return to the measuring cycle.

Description of Communication Protocols

The communication protocols are not included in this manual. Please refer to the specific documentation for more information on the supported protocols.

Instruction Manual for use of transducer: T4311 (RS232), T4411 (RS485)

Transducer is designed for temperature measurement at °C or °F by means of the external temperature probe with an RTD Pt1000 sensor. It is built in a plastic case with IP65 protection. Read this manual before the first transducer connection. Transducer T4311 communicates via link RS232, and transducer T4411 via link RS485. Supported communication protocols are Modbus RTU, protocol compatible with standard Advantech-ADAM, ARION, and communication with HWg–Poseidon devices. The measured value is displayed on a dual-line LCD display. The display can be also switched OFF. Output link RS485 of transducer T4411 is galvanic isolated. Output link RS232 of transducer T4311 is NOT galvanic isolated.

Use the user’s software TSensor for the setting of all device parameters (recommended). It is free to download at www.cometsystem.com. It supports making the adjustment of the device too. This procedure is described at file „Calibration manual.pdf“ which is installed commonly with the software. Change of some parameters is possible to do without the user’s software with Windows Hyperterminal (change of communication protocol, its parameters, LCD display setting). It is described in the file “Description of communication protocols of Txxxx series” which is free to download at the same address.

Transducer version TxxxxL with a watertight male connector instead of a cable gland (RS232) or glands (RS485) is designed for easy connection/disconnection of communication cable. Male Lumberg connector RSFM4 has protection IP67.
Models marked TxxxxZ are non-standard versions of the transducers. A description is not included in this manual.

Transducer setting from the manufacturer
If a special setting was not required in the order, the transducer is set by the manufacturer to the following parameters:

communication protocol: Modbus RTU
transducer address: 01H
communication speed: 9600Bd, no parity, 2 stop bits
display: switched ON

Transducer installation

Transducer is designed for wall mounting. There are two mounting holes at the sides of the case. Don’t connect the device while the power supply voltage is on. Interconnection terminals for T4311 and T4411 devices are accessible after unscrewing four screws and removing the lid. Lace the cable through a gland at the case wall. Connect the cable to terminals with respecting the signal polarity (see figure). Terminals are self-clamping and can be opened by a suitable screwdriver. For the opening, insert the screwdriver to the smaller terminal hole and lever by him. Do not forget to tighten glands and case lid with inserted packing after the cables connect. It is necessary for warranting of protection IP65. Connect complementary female connectors for T4311L and T4411L transmitters in accordance with the table in Appendix B of this manual. Working position is negligible.

The external temperature probe should be of a „shielded two-wire“ type. For leading of the cable same recommendations are valid as for the current loop cable, i.e. cable should be located as far as possible from potential interference sources. The maximum probe cable length is 10 m. Connect probe cable shielding to the proper terminal and do not connect it to any other circuitry and do not ground it. If the connected probe is equipped with metal stem, we recommend to use probes with metal stem not connected to cable shielding. Or else it is necessary to arrange metal stem is not connected to any other circuitry.
Devices T4311 are supplied with a connection cable equipped with a connector for connection to the RS232 interface. For devices with RS485 output, there is recommended to use shielded twisted copper cable, with maximal length of 1200m. The cable must be located at indoor rooms. Nominal cable impedance should be 100 Ω, loop resistance max. 240 Ω, cable capacity max. 65 pF/m. The outside diameter of the cable for the T4411 connection must be from 3 to 6.5 mm. Suitable cable is e.g. SYKFY 2x2x0.5 mm2, where one wire pair serves for device powering and the other pair for the communication link. For devices T4311L and T4411L use cable with respect to female connector parameters. Do NOT connect shielding at the connector side.

The cable should be led in one line, i.e. NOT to „tree“ or „star“. The termination resistor should be located at the end. For short distance, another topology is allowed. Terminate the network by a termination resistor. The value of the resistor is recommended about 120 Ω. For short-distance termination, the resistor can be left out.
The cable should not be led in parallel along the power cabling. Safety distance is up to 0.5 m, otherwise, undesirable induction of interference signals can appear.
The electrical system (wiring) may do only worker with the required qualifications by rules in operation.

Dimensions

T4311

COMET SYSTEM T4311 Programmable Temperature Transducer-
fig-1 T4411 COMET SYSTEM T4311
Programmable Temperature Transducer-fig-2 T4311L, T4411L

Typical application wiring, the connection of terminals

COMET SYSTEM T4311 Programmable Temperature Transducer-
fig-4

T4411 – RS485 COMET SYSTEM T4311 Programmable Temperature Transducer-
fig-5

Info mode

If in doubt of the setting of the installed transducer, verification of its address is enabled even without using the computer. Power should be connected.
Unscrew the transducer cover and shortly press the button next to the connection terminals (the jumper must be open). The actual adjusted address of the transducer is displayed on LCD display at decimal base, for HWg-Poseidon’s communication protocol there is shown a number corresponding with the ASCII address code. Next press of the button exits info mode and actual measured values are displayed.

Note: No measurement and communication is possible during info mode. If the transducer stays in info mode for longer than 15 s, the transducer automatically returns to the measuring cycle.
Description of communication protocols

A detailed description of each communication protocol including examples of communication is available in the individual document “Description of communication protocols of Txxxx series” which is free to download at www.cometsystem.com.
Note: After switching ON the power of the device it can last up to 2 s before the device starts to communicate and measure!

Modbus RTU

Control units communicate on the master-slave principle in half-duplex operation. Only the master can send a request and only the addressed device responds. During sending of the request, no other slave station should respond. During communication, data transfer proceeds in binary format. Each Byte is sent as an eight-bit data word in the format: 1 start bit, data word 8 bit (LSB first), 2 stop bits1, without parity. The transmitter supports communication speeds from 110Bd to 115200Bd.

Sent request and response have the syntax: ADDRESS OF DEVICE – FUNCTION – Modbus CRC

Supported functions
03 (0x03): Reading of 16-bit registers (Read Holding Registers)
04 (0x04): Reading of 16-bit input gates (Read Input Registers)
16 (0x10): Setting of more 16-bit registers (Write Multiple Registers)

Jumper and button

The jumper and button are located next to the connection terminals. If the communication protocol Modbus is selected the function of the jumper and button is as follows:

Jumper opened – transmitter memory is protected from writing, from the transmitter side it is only enabled to read measured value, and writing to memory is disabled (no change of transmitter address, communication speed and LCD setting is enabled).
Jumper closed – writing to transmitter memory is enabled by means of the User’s software.
Jumper closed and button pressed for longer than six seconds – causes restoring of manufacturer setting of communication protocol, i.e. sets Modbus RTU communication protocol, device address sets to 01h and communication speed to 9600Bd – after button press there is “dEF” message blinking at LCD display. Six seconds later message “dEF” stays shown, it means the manufacturer setting of the communication protocol is done.
Jumper opened and the button was shortly pressed – transmitter goes to Info mode, see chapter „Info mode“.

Modbus registers of the device

Variable| Unit| Address [hex] X| Address [dec] X| Format| Size| Status
---|---|---|---|---|---|---
Measured temperature| [°C]| 0x0031| 49| Int10| BIN16| R
Address of transmitter| [-]| 0x2001| 8193| Int| BIN16| R/W
Code of communication speed| [-]| 0x2002| 8194| Int| BIN16| R/W*
Serial number of transmitter Hi| [-]| 0x1035| 4149| BCD| BIN16| R
Serial number of transmitter Lo| [-]| 0x1036| 4150| BCD| BIN16| R
A version of Firmware Hi| [-]| 0x3001| 12289| BCD| BIN16| R
A version of Firmware Lo| [-]| 0x3002| 12290| BCD| BIN16| R

Explanation:

Int10 register is in the format integer10
Register is designed only for reading
W*register is designed for writing, for more details see the chapter description of communication protocols
Xregister addresses are indexed from zero – register 0x31 is physically sent as value 0x30, 0x32 as 0x31 (zero based addressing)

Note: In case there is a need for reading of measured values from the transmitter with higher resolution than one decimal, measured values in the transmitter are stored also in „Float“ format, which is not directly compatible with IEEE754.

Protocol compatible with Advantech-ADAM standard

Control units communicate on the master-slave principle in half-duplex operation. Only the master can send requests and only the addressed device responds. During sending requests any of slave devices should respond. During communication data is transferred in ASCII format (in characters). Each Byte is sent as two ASCII characters. Transmitter supports communication speed from 1200Bd to 115200Bd, parameters of the communication link are 1 start bit + eight bit data word (LSB first) + 1 stop bit, without parity.

Jumper

Jumper is located next to the connection terminals. If a communication protocol compatible with standard Advantech-ADAM is selected, its function is the following:

If the jumper switching ON the power is closed, the transmitter always communicates with the following parameters regardless stored setting in the transmitter:
communication speed 9600 Bd, without checksum, transmitter address 00h
If the jumper during switching ON the power is not closed, the transmitter communicates in accordance with the stored setting.
If the jumper is closed during transmitter operation, the transmitter temporarily changes its address to 00h, it will communicate in the same communication speed as before closing jumper and will communicate without check sum. After the jumper is opened setting of the address and checksum is reset in accordance with values stored in the transmitter.
Communication speed and checksum are possible to change only if the jumper is closed.
Jumper closed and button pressed for longer than six seconds – causes restoring of manufacturer setting of communication protocol, i.e. sets Modbus RTU communication protocol, device address sets to 01h and communication speed to 9600Bd – after button press there is “dEF” message blinking at LCD display. Six seconds later message “dEF” stays shown, it means the manufacturer setting of the communication protocol is done.]

ARION communication protocol – AMiT company

The device supports communication protocol ARiON version 1.00. For more details see file “Description of communication protocols of Txxxx series” or www.amit.cz.

Communication with HWg Poseidon units

The device supports communication with HWg-Poseidon units. For communication with this unit set the device with setup software TSensor to communication protocol HWg–Poseidon and set the correct device address. This communication protocol supports read temperature at °C, relative humidity, one of computed values (dew point temperature or absolute humidity) and barometric pressure at kPa (depending by device type). For atmospheric pressure correction to altitude setting there is Users software TSensor.

Jumper and button

If communication with HWg Poseidon unit is selected, the function of the jumper and button is as follows:

Jumper opened and the button was shortly pressed – the device goes to Info mode, see chapter „Info mode“.
Jumper closed and button pressed for longer than six seconds – causes restoring of manufacturer setting of communication protocol, i.e. sets Modbus RTU communication protocol, device address sets to 01h and communication speed to 9600Bd – after button press there is “dEF” message blinking at LCD display. Six seconds later message “dEF” stays shown, it means the manufacturer setting of the communication protocol is done.

Error states of the device

The device continuously checks its state during operation. In case an error is found LCD displays the corresponding error code:

Error 0

First line displays „Err0“.
Check the sum error of the stored setting inside the device’s memory. This error appears if an incorrect writing procedure to device’s memory occurred or if damage of calibration data appeared. At this state device does not measure and calculate values. It is a serious error, contact the distributor of the instrument to fix.

Error 1

The measured value is over the upper limit of the allowed full-scale range. There is a reading „Err1“ on LCD display. This state appears if measured temperature is higher than approximately 600 °C (i.e. high non-measurable resistance of temperature sensor, probably opened circuit).

Error 2

There is a reading „Err2“ on LCD display. Measured value is below lower limit of allowed full scale range. This state appears if measured temperature is lower than approximately -210 °C (i.e. low resistance of temperature sensor, probably short circuit).

Error 3

There is a reading „Err3“ on LCD display upper line.
Error of internal A/D converter appeared (converter does not respond, probably damage of A/D converter). No measurements proceed. It is a serious error, contact distributor of the instrument.

Readings on LCD display

°C, °F
Reading next to this symbol is measured temperature or error state of value.

symbol 3 near by left display margin Is on if jumper is closed.

Technical parameters of the instrument:
RS 485 Interface:

Receiver-Input Resistance: 96 kΩ
Devices on bus: max. 256 (1/8 Unit Receiver Load)

Measuring parameters:

Temperature probe : Pt1000/3850 ppm connected by a shielded cable of maximum length 10m
Measuring temperature range: -200 to +600 °C (can be limited by applied temperature probe model)
Resolution: 0.1 °C
Accuracy (without probe): ±0.2 °C
Recommended calibration interval: 2 years
Measuring interval and LCD display refresh: 0.5 s
Power: 9 to 30 V protection: IP65

Operating conditions:

Operating temperature range: -30 to +80 °C, over +70°C switch LCD display OFF
Operating relative humidity range: 0 to 100 %RH
Outer influence in accordance with Czech National Standard 33-2000-3:
normal environment with those specifications: AE1, AN1, AR1, BE1 Working position: negligible
Electromagnetic compatibility: complies EN 61326-1

Not allowed manipulation

It is not allowed to operate the device under conditions other than those specified in technical parameters. Devices are not designed for locations with chemically aggressive environments.

Storing conditions: temperature -30 to +80 °C, humidity 0 to 100 %RH without condensation Dimensions: see dimensional drawings
Weight: approximately T4311 215 g, T4311L 145 g, T4411(L) 145 g
Material of the case: ASA

End of operation
The device itself (after its life) is necessary to liquidate ecologically!

Technical support and service
Technical support and service is provided by the distributor. For contact see the warranty certificate.

Appendix A

Connection of ELO E06D (RS232/RS485) and ELO 214 (USB/RS485) converters COMET
SYSTEM T4311 Programmable Temperature Transducer-fig-6

The ELO E06D converter is an optional accessory for connection of the transmitter with RS485 interface to the PC via serial port RS232. Connect the connector marked RS232 directly to the PC, and connect the power to the connector marked RS485. Power voltage +6V D C from an external acdc adapter connects to pin 9, 0V connects to pin 5. Also mutually connect pin 2 and pin 7. Link RS485 is connected across pin 3 (A+) and pin 4 (B-).
The ELO 214 converter is an optional accessory for connection of the transmitter with RS485 interface to the PC via a USB port. Link RS485 is connected across pin 9 (A+) and pin 8 (B-).

Appendix B

COMET SYSTEM T4311 Programmable Temperature Transducer-
fig-7

Documents / Resources

| COMET SYSTEM T4311 Programmable Temperature Transducer [pdf] Instruction Manual
T4311, T4311 Programmable Temperature Transducer, Programmable Temperature Transducer, Temperature Transducer, Transducer, T4411
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