ABB AO2000 Series - Modbus Module: Electrical Connections

AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 109
Modbus module: Electrical connections
RS232 interface
Pin Signal
2 RxD
3 TxD
5 GND
Design: 9-pole male Sub-D plug
RS485 interface
Pin Signal
2 RTxD–
3 RTxD+
5 GND
Design: 9-pole female Sub-D plug
NOTE
For additional information on "Modbus", refer to the Technical Information
"AO2000 Modbus and AO-MDDE".