User Documentation

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4.6 Pin Assignments
4.6.1 DB9 male connector (RS232)
Use DB9 connector (male) for RS-232 connections to Modbus RTU or ASCII devices.
4.6.2 Terminal Block (RS-422, RS-485)
Use terminal block connector for RS-422 and RS-485 connections to Modbus RTU or ASCII devices.
4.6.3 Power Input, Relay Output
Relais conditions:
Open when Power-off or when a relay-based alarm is
triggered.
Closed when Power-on and no relay-based alarm is
triggered.
V2+
V2-
V1+
V1-
Shielded
Ground
DC Power
Input 2
DC Power
Input 2
Relay
Output
Relay
Output
DC Power
Input 1
DC Power
Input 1
Pin RS-232
1 DCD
2 RxD
3 TxD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
Pin
RS-422
RS-485 (4-wire)
RS-485 (2-wire)
1 TxD+ ---
2 TxD- ---
3 RxD+ Data+
4 RxD- Data-
5 GND GND