Protech Systems PPC-7400 Operation Manual page 25

COM3 : COM3 Connector
The pin assignments are as follows :
PIN ASSIGNMENT
1 NDCDC
2 NSINC
3 NSOUTC
4 NDTRC
5 GND
6 NDSRC
7 NRTSC
8 NCTSC
9 RIN3
COM4 : COM4 Connector
The pin assignments are as follows :
PIN ASSIGNMENT
1 NDCDD
2 NSIND
3 NSOUTD
4 NDTRD
5 GND
6 NDSRD
7 NRTSD
8 NCTSD
9 RIN4
All COM port's pin 9 is selectable for RI, +5V or +12V. For
more information, please refer to our "COM RI and Voltage
Selection"
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PPC-740X USER S MANUAL
Chapter 2 Hardware Configuration
Page: 2-7