Schneider Electric Processor Adapter - Manual (Page 70)

Option Adapters
70 870 USE 101 10 V.2
Front Panel Components, Continued
Pinouts for
Modbus Port 2 The 172 JNN 210 32 Serial Option Adapter uses the following pinouts:
Pin For RS232 For RS485
1 DTR RXD -
2 DSR RXD +
3 TXD TXD +
4 RXD
5 signal common signal common
6 RTS TXD -
7 CTS
8 cable shield cable shield