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The qhy5 and sbig cables are opposite. One is straight and one is reversed. Been there done that..... pulled my hair out. Didnt blow anything up, fortunetly for me!
There is 6 cables in the plug. In no particular order are:
1 common 12v negative, the 4 directional wires, and sbig cameras supply a 12+ down the wire left over. Not sure about your camera, but the st402 has a jumper that can be inserted or removed to suplly the 12v +. My st4000xcm supplies the 12v, and I havent installed a jumper in that camera.
The 12v positive is used to used to fire the relays on the sbig relay box, to isolate the signals from the mount to the camera, which can cause issues with some mounts, like the earlier geminis and AP's.
Brett
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