C-3. DL-303 Modbus Address Mappings (Base 1)
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Address Description
Attribute
30321
40321
Number of the analog input channels
Only for Modbus TCP protocol
30331
40331
Number of the analog output channels
Only for Modbus TCP protocol
R
30352
40352
Firmware version in hex format
Only for Modbus TCP protocol
R
40450
Relative humidity offset in 0.01%
R/W
40451
Temperature offset in 0.01°C
R/W
40481
Firmware version (low word)
R
40482
Firmware version (high word)
R
40483
Module name (low word), 0x0303
R
40484
Module name (high word), 0x444C
R
40485
RS-485 module address, 1 to 247
Only for Modbus RTU protocol
R/W
40486
RS-485 baud rate and parity settings
Bits 5:0
Baud rate, valid range: 3 ~ 10
Code
0x03
0x04
0x05
0x06
Baud
1200 2400 4800 9600
Code
0x07
0x08
0x09
0x0A
Baud
19200 38400 57600 115200
Bits 7:6
00: no parity, 1 stop bit (N,8,1)
01: no parity, 2 stop bit (N,8,2)
10: even parity, 1 stop bit (E,8,1)
11: odd parity , 1 stop bit (O,8,1)
Only for Modbus RTU protocol
R/W
40488
RS-485 response delay time in ms, valid range, 0 ~ 30
Only for Modbus RTU protocol
R/W
40489
RS-485 host watchdog timeout value, 0 ~ 255, in 0.1s
Only for Modbus RTU protocol
R/W
40492
RS-485 host watchdog timeout count, write 0 to clear
Only for Modbus RTU protocol
R/W
40495
LCD back light setting, 0 to 255
R/W
40496
Automatic baseline correction for CO
2
measurement,
0: disable, 1:enable
R/W