The Tally light on the CM70-series (including the NDI camera) is part of the optional license LC70-1 that also includes the Customizable Color Matrix CCM and SRT streaming. Without a license, the LED on the front is not controllable.


There are no status inquiry commands for the Tally light function, but RED, GREEN, OFF commands over VISCA (either IP or serial):


CommandFunctionCommand Packet
Comments

CAM_TallyLight

(Cm7x only with license active)


Red8x 01 7E 010A 00 02 03 FFTally Light Red ON
Green8x 01 7E 010A 00 03 02 FFTally Light Green ON
Off8x 01 7E 010A 00 03 03 FFTally Light OFF


* Usually the Tally light is controlled via the video switcher.


* If using a CM70-NDI, don't forget to tick the box "Tally Light Enable":