Aaeon PCM-4894 User Manual page 30

The digital I/O interface of PCM-4894 provides 4 TTL input bits
& 4 Open-Collector output bits. The following table lists the pin
assignment for CN10.
Pin
1
2
3
4
5
6
7
8
9
10
24 PCM-4894 User Manual
Function
TTL Input Bit 0
O.C. Output Bit 0
TTL Input Bit 1
O.C. Output Bit 1
TTL Input Bit 2
O.C. Output Bit 2
TTL Input Bit3
O.C. Output Bit3
+5V
GND