ADLINK PCI-8124-C - Manual (Page 30)

20 Signal Connections
3.4 Isolated Output Ports (TRG, EGND)
There are 4 independent isolated output ports on PCI-8124-C.
Because the use of photo coupler PS9115, the output pull high is
not needed. The pin assignment of the isolated output ports on
PCI-8124-C is as follows, and PS9115 output characteristics are
described in the following figure.
CN1 Pin No. Name Description
5 EGND Output reference
7 EGND Output reference
30 EGND Output reference
32 EGMD Output reference
6 TRG1 Trigger 1
8 TRG2 Trigger 2
31 TRG3 Trigger 3
33 TRG4 Trigger 4