Arcom Digital I/O Connector pinout

  Function Pin Function
+5V 50 49 +5V
+12V 48 47 -12V
  D 46 45 D Group
4
D 44 43 D
S 42 41 GND
Ch7 40 39 Ch6 Group

3
Ch5 38 37 Ch4
Ch3 36 35 Ch2
Ch1 34 33 Ch0
S 32 31 GND
Ch7 30 29 Ch6 Group

2
Ch5 28 27 Ch4
Ch3 26 25 Ch2
Ch1 24 23 Ch0
S 22 21 GND
Ch7 20 19 Ch6 Group

1
Ch5 18 17 Ch4
Ch3 16 15 Ch2
Ch1 14 13 Ch0
S 12 11 GND
  Ch7 10 9 Ch6 Group

0
Ch5 8 7 Ch4
Ch3 6 5 Ch2
Ch1 4 3 Ch0
GND 2 1 GND
Connector: Berg 50-way IDC.

Seen: Looking into PCB-mounted header.

GND: Ground reference voltage

+5V: Powers most logic.

+12V: -12V: Primarily useful for RS232 buffer power.

D: Data bit

S: Special functions