Comet T0310 User manual

TRANSMITTER T0310, T0410
Programmable temperature transmitter with serial output RS232 and RS485
Instruction manual

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Instruction Manual for use of transmitter:
T0310 (RS232)
T0410 (RS485)
Transmitter is designed for measurement of ambient temperature of air without aggressive
ingredients. Read this manual before the first transmitter connection. Transmitter T0310
communicates via link RS232, transmitter T0410 via link RS485. Supported communication
protocols are Modbus RTU, protocol compatible with standard Advantech-ADAM and ARION.
Measured value is displayed on LCD display. Display can be also switched OFF. Output link
RS485 of transmitter T0410 is galvanic isolated. Output link RS232 of transmitter T0310 is NOT
galvanic isolated. Setting of all transmitter parameters is enabled in accordance with procedure
described in chapter „Setting of transmitter, selection of communication protocol“ or by means of
commands of selected communication protocol.
Transmitter setting from the manufacturer
If special setting was not required in the order, transmitter is set from the manufacturer to the
following parameters:
communication protocol: Modbus RTU
transmitter address: 01H
communication speed: 9600Bd, no parity, 2 stop bits
display: switched ON
Transmitter installation
Transmitter is designed for wall mounting. There are two mounting holes at the sides of the
case. Don’t connect transmitter while power supply voltage is on. Interconnection terminals are
accessible after unscrewing four screws and removing the lid (if necessary). 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 smaller terminal hole and lever by him. Do not forget to tighten glands and
case lid with inserted packing after cables connecting. It is necessary for warranting of protection
IP65. Working position is with the stem downwards – see figure.
Transmitter T0310 is supplied with connection cable equipped with connector for connection to
RS232 interface. For T0410 transmitter (RS485) it is recommended to use shielded twisted copper
cable (e.g. SYKFY). Outside diameter of the cable must be from 3 to 6.5 mm, maximal length
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. Suitable cable is e.g. SYKFY 2x2x0,5 mm2, where one wire pair serves for
transmitter powering and the other pair for communication link.
The cable should be led in one line, i.e. NOT to „tree“ or „star“. Termination resistor should
be located at the end. For short distance other topology is allowed. Terminate the network by a
termination resistor. The value of the resistor is recommended about 120 Ω. For short distance
termination resistor can be left out.
The cable should not be led in parallel along power cabling. Safety distance is up to 0.5 m,
otherwise undesirable induction of interference signals can appear.

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Dimensions
T0310 – RS232
T0410 – RS485

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Typical application wiring, connection of terminals
T0310 – power from communication port T0310 – power from external voltage source
T0410 – RS485

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Info mode
If in doubt of setting of installed transmitter, verification of its address is enabled even
without using computer. Power should be connected.
Unscrew transmitter cover and shortly press button next to connection terminals (jumper
must be open). Actual adjusted address of transmitter is displayed at decimal code. Next press of
button exits info mode and actual measured values are displayed.
Note: No measurement and communication is possible during info mode. If transmitter stays in info
mode for longer than 15 s, transmitter automatically returns to measuring cycle.
Setting of transmitter, selection of communication protocol
Each new setting of transmitter parameters is stored in its internal memory1. If modification of
transmitter setting is needed (communication protocol, its parameters, setting of LCD display) it is
recommended to use of User’s software available at www.cometsystem.cz (providing all settings of
transmitter parameters) or proceed in following way (support basic setting):
•Connect transmitter with PC, for T0410 (RS485) use converter RS485/RS232 RS232 (with
automatic switching control).
•Run program „HyperTerminal“ on your computer – it is a part of Windows operating system
(Start →Program Files →Accessory →Communication →HyperTerminal) and set
transmission parameters. I.e. enter name of new connection (e.g. Sensor), press button OK,
window „Connect“ appears. In field „Connect by means of“ select COM port, which transmitter
is connected to (e.g. COM1) and press OK. In following window „COM1 – Properties“ enter to
field:
„Bits per second“ 9600
“Data bits“ 8
“Parity“ None
“Number of stop-bits“ 1
“Flow control“ None
Continue by pressing OK.
1During writing to transmitter memory no power failure should appear! Such failure can cause
damage of other settings stored in the transmitter!

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•Select item „File“, „Features“ in menu. Select bookmark „Setup“, in the window, click on
„ASCII Setup...“ and modify all items in accordance with following figure. Then press OK
•Unscrew 4 screws of transmitter cover and remove it. Plug in jumper.
•Keep the button inside the transmitter pressed, only now you can connect power voltage and
then release the button. If transmitter is powered directly from PC communication port (for
interface RS232), it is necessary first disconnect communication cable, then to keep the button
pressed, to connect communication cable (and also power) and only now release the button.
•LCD display of the transmitter displays „PC“.
•Running HyperTerminal displays main menu.
Select required items to set the transmitter:
0 …Displays actual setting of the transmitter

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1 …Selection of communication protocol and setting of its parameters (transmitter address,
communication speed…). For entering numeric values use digits 0 to 9 and characters
„A“ to „F“ (upper case letters), transmitter address is entered always as two digits
hexadecimal number (no decimal, e.g. address 11 i.e. Bh must be entered as 0B).
2 …Setting of LCD display of the transmitter (display switched ON/OFF, selection of
displayed values)
8 …Setting communication to default value from manufacturer (Modbus, address 01h,
9600 Bd)
9 …End of setting
All changes in setting are continuously automatically stored.
•At the end open the Jumper and if needed, close the transmitter again with cover.
Description of communication protocols
Detailed description of each communication protocols including examples of
communication is available in individual document “Description of communication protocols of
Txxxx series” which is free to download at www.cometsystem.cz.
To change communication protocol use User’s software or proceed in accordance with
chapter „Setting of transmitter, selection of communication protocol“
Note: After switching ON the power of the transmitter it can last up to 2 s before the transmitter
starts to communicate and measure!
Modbus RTU
Control units communicate on master-slave principle in half-duplex operation. Only master
can send request and only addressed device responds. During sending of request no other slave
station should respond. During communication, data transfer proceeds in binary format. Each Byte
is sent as eight bit data word in format: 1 start bit, data word 8 bit (LSB first), 2 stop bits2, without
parity. Transmitter supports communication speed from 110Bd to 115200Bd.
Sent request and response have 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
Jumper and button are located next to connection terminals. If communication protocol
Modbus is selected the function of jumper and button is as follows:
•Jumper opened – transmitter memory is protected from writing, from transmitter side it is
only enabled to read measured value, 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 User’s software
•Jumper closed and button pressed for longer than three seconds – causes restoring of
manufacturer setting of communication protocol, i.e. sets transmitter address to 01h and
communication speed to 9600Bd
2Transmitter sends two stop bits, for receive one stop bit is enough.

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•Jumper opened and button shortly pressed – transmitter goes to Info mode, see chapter „Info
mode“
Modbus registers of the device
Variable Unit AddressXFormat Size Status
Measured temperature [°C] 0x0031 Int*10 BIN16 R
Address of transmitter [-] 0x2001 Int BIN16 R/W*
Code of communication speed [-] 0x2002 Int BIN16 R/W*
Serial number of transmitter Hi [-] 0x1035 BCD BIN16 R
Serial number of transmitter Lo [-] 0x1036 BCD BIN16 R
Version of Firmware Hi [-] 0x3001 BCD BIN16 R
Version of Firmware Lo [-] 0x3002 BCD BIN16 R
Explanation:
•Int*10 register is in format integer*10
•R register is designed only for reading
•W* register is designed for writing, for more details see 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 transmitter with higher resolution
than one decimal, measured values in transmitter are stored also in „Float“ format, which is not
directly compatible with IEEE754.
Protocol compatible with Advantech-ADAM standard
Control units communicate on master-slave principle in half-duplex operation. Only master
can send requests and only addressed device responds. During sending request 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 communication link are 1 start bit + eight bit data word (LSB first) +
1 stop bit, without parity.
Jumper
Jumper is located next to connection terminals. If communication protocol compatible with
standard Advantech-ADAM is selected, its function is the following:
•If jumper during switching ON the power is closed, transmitter always communicates with
following parameters regardless stored setting in the transmitter:
communication speed 9600 Bd, without check sum, transmitter address 00h
•If jumper during switching ON the power is not closed, transmitter communicates in
accordance with stored setting.
•If jumper is closed during transmitter operation, 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 jumper is opened setting of address and check
sum is reset in accordance with values stored in transmitter.
•Communication speed and check sum are possible to change only if jumper is closed.

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ARION communication protocol - AMiT company
The device supports communication protocol ARION version 1.00. For more details see
chapter description of communication protocols.
Error states of the device
Device continuously checks its state during operation. In case error is found LCD displays
corresponding error code:
Error 0
First line displays „Err0“.
Check sum error of stored setting inside device’s memory. This error appears if 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 distributor of the
instrument to fix.
Error 1
Measured value is over upper limit of 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
Reading next to this symbol is measured temperature or error state of value.
first left arrow
Is on if jumper is closed.
second left arrow
Is on if button is pressed.

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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:
Ambient temperature (RTD sensor Pt1000/3850ppm):
Measuring range: -30 to +80 °C
Resolution of display: 0.1 °C
Accuracy: ± 0.4 °C
Response time (air flow approximately 1 m/s):
temperature: t90 < 4 min (temperature step 20 °C)
Recommended calibration interval: 2 years
Measuring interval and LCD display refresh: 0.5 s
Power: 9 to 30 V dc
Consumption: T0310 (RS232) 6 mA
T0410 (RS485) max. 0.5W
Protection: IP65
Operating conditions:
Operating temperature range: -30 to +80 °C, switch the LCD display OFF over +70°C
Operating relative humidity range: 0 to 100 %RH
Outer influence in accordance with EN 33-2000-3: normal environment with those
specifications: AE1, AN1, AR1, BE1
Working position: with the stem downwards
Electromagnetic compatibility: complies EN 61326-1
Not allowed manipulation
It is not allowed to operate the device under conditions other than specified in technical parameters.
Devices are not designed for locations with chemically aggressive environment.
Storing conditions: temperature -30 to +80 °C, humidity 0 to 100 %RH without condensation
Dimensions: case with electronics 89 x 73 x 37 mm, length of stem 53 mm
Weight: approximately 200 g
Material of the case: ABS
End of operation
Device itself (after its life) is necessary to liquidate ecologically!
Technical support and service
Technical support and service is provided by distributor. For contact see warranty certificate.

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Appendix A
Connection of ELO E06D converter (RS232/RS485)
(optionally accessory of the transmitter T0410)
The ELO E06D converter is an optional accessory for connection of transmitter/transmitters with
RS485 interface to the PC via serial port RS232. Connect connector marked RS232 directly to the
PC, connect power to connector marked RS485. Power voltage +6V DC from an external ac/dc
adapter connect to pin 9, 0V connect to pin 5. Also mutually connect pin 2and pin 7. Link RS485
is connected across pin 3 (A+) and pin 4 (B-).