Instruction manual

Modbus registers of the device
Variable Unit Address
X
Format 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
•
X
register 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.
• 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 manufacturer setting of communication protocol is done).
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