The AUX pin-out:
PRO 4
1 Video-
2 Video +
3 24 VDC + (30 Watts*)
4 Aux + (APIC) Connects to tether pin 4 and control panel AUX port pin 7
5 Power Common (Ground)
6 Aux - (APIC) Connects to tether pin 6 and control panel AUX port pin 8
7 RS-485 -/A
8 RS-485 +/B
9 12 VDC + (30 Watts*)
PRO 3, Pro 3 GTO, Deep Blue
1 Video -
2 Video +
3 48 VDC +, 30 Watts*
4 Aux +
5 Ground
6 Aux -
7 Manipulator 24 VDC -
8 Manipulator 24 VDC +
9 12 VDC +, 6 Watts
More information: http://wwv.videoray.com/Downloads/accessory_use_v2rf.pdf
Scout and Explorers do not include the accessory connector.