TANDBERG 7000 MXP - Manual (Page 251)

Appendices
251
This connector is used when cascading cameras: Control (out) signal and external camera
detection. Note: It does not provide power for cascaded camera.
PRI Pinout
Pin-6 GND
Pin-5 GND
Pin-4 RXD (in)
Pin-3 TXD (out)
Pin-2 Presence (+12V in
daisy chain)
Pin-1 GND
Multiple Camera support:
The figure below is an example of how multiple cameras should be connected: