| Functions of the 5 wires |
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This is the ground wire (supply negative). Its function is to be a 0V reference for
- A and B video signals,
- for the door opener
- for the call
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This is the 19V DC positive supply for the video monitors, when they are on.
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This wire carries the video signal with wire B
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This wire carries the video signal with wire A
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This wire carries the
- call
- speech
- door opener signal
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