MR MESSKO MTRAB - RS485 and Modbus Configuration

6 Electrical connection
63BA6820378-03 EN
6.9 Connecting the RS485 interface and configuring Modbus
(optional)
The MESSKO® MTRAB® can be connected with a SCADA system via the
RS485 interface. This is designed as a 4-conductor system (full duplex), but
can also be integrated into a 2-conductor system (half duplex).
RS485 interface assignment for Modbus RTU
PINs 4-conductor system 2-conductor system
1 Rx+ D+
1 Rx- D-
2 Tx-
2 Tx+
Shield Shield
Comm Comm
6.9.1 4-conductor full duplex
Figure42: 4-conductor system