Rievtech x-Messenger Series - 6 Multiple Modbus Communication Protocol

151
1------RS485 A1
6------RS485 B1
2------
3------
4------GND
5------Battery
Communication between CPU and expansion module will use pin 1, 6. This is COM1.
EXM-E-RS485 module is required when EXM-12 CPU needs to communicate with third party devices
via RS485 bus and then these pins (1 and 6) will be used by EXM-E-RS485 module .This is COM1.
So if you had use any extension module with EXM-12 CPU, EXM-E-RS485 shall be unavailable.
Note: 1.The baud rates and communication mode(Modbus RTU/ASCII/TCP) of COM0, COM1 can
be modified via the panel key.
2. The COM1 port also can work as the common RS485 port, when there is no expansion
module in the application.
3.3.6Multiple Modbus communication protocol.
There are three optional communication protocols available. Refer to the communication protocol file for
details. Following are the register addresses for the x-Messenger.
Name
Code
Set address method
(DECIMAL)
Data format
Attribute