Serial I/O Adapter (CCB-PIO-DB15-05ST)

This is a male connector/plug.

Pin Number Signal Name
1 Reserved
2 TxD
3 RxD
4 GND
5 DC+ (system power, 5-24 VDC)
6 NC
7 Output-0
8 Input-0
9 NC
10 NC
11 NC
12 Output-Common
13 NC
14 Reserved
15 Reserved