
Compact Board PCM-QM77
Chapter 2 Quick Installation Guide 2-43
Pin Pin Name Signal Type Signal Level
1 RS485_D- I/O
±5V
2 RS485_D+ I/O
±5V
3 NC
4 NC
5 GND GND
6 NC
7 NC
8 NC
9 NC/+5V/+12V PWR +5V/+12V
10 NC
RS422_TX+
RS422_RX-
NC
NC
NC
RS422_TX-
12
910
RS422_RX+
GND
NC
NC/+5V/+12V
RS-422
Pin Pin Name Signal Type Signal Level
1 RS422_TX- OUT
±5V
2 RS422_TX+ OUT
±5V
3 RS422_RX+ IN
4 RS422_RX- IN
5 GND GND
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