E2218
Rev 14.05.2021
Modbus RTU Communication
Modbus main holding registers (00xxx or 40xxx): 0-based, decimal
Reg RW Description
1 R
hardware version
2 R
software version
3 R
product serial number
4 RW Slave ID [1...247], default 1
5 RW baud rate, default 9600
6 RW response delay [1...255] ms, default 10
7 RW stop bits , parity bit [1,2,3,4], default 1
17 RW write ‘42330’ to restart
168 RW integrating time constant [0...32000] s
201 RW OUT1 parameter, 0:none, 1:T, 2:RH
202 RW OUT2 parameter, 0:none, 1:T, 2:RH
258 R
temperature, °C×100, signed integer
259 R
humidity, %RH×100, integer
261 RW OUT1 out 0%, [±1000] °C / %RH
262 RW OUT1 out 100%, [±1000] °C / %RH
263 RW OUT2 out 0%, [±1000] °C / %RH
264 RW OUT2 out 100%, [±1000] °C / %RH
Note! New Slave ID, baud rate and stop bits values apply after restart
Supported Modbus functions: 03 - read multiple registers, 06 - write single register
12
