1) Data 1+
2) Data 1-
3) Data 2+ (Shutter doesn't use, just passes it through)
4) N/C
5) N/C
6) Data 2- (Shutter doesn't use, just passes it through)
7) Signal Common (0 V) for Data 1
8) Signal Common (0 V) for Data 2 (Shutter doesn't use, just passes it through)