Datavideo PTR-10 MK II Robotic Head & RMC-180 MK II Pan/Tilt Controller Kit - Manual (Page 22)

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4.4 Tally
Two tally sockets can be found on your PTR series device. Tally IN receives tally information from
external devices such as a video switcher. Tally OUT delivers tally information to the mounted
camera.
Tally Light Definitions
Message On Air/Live Standby/Cued Free/Safe
Light Red Green No Light
A simple test tool is illustrated in the diagram below.