Hello forum,

we are an education institution and use a system with 3 Sony BRC-X1000 PTZ cameras, which are routed via SDI through a BMD ATEM Constellation 4K and BMD Decklink Quad into a Windows 11 PC with vMix 28. The cameras are also connected via ethernet to our network with their own subnet, and can be controlled by a Sony PTZ controller.
We have managed to get the video inputs into vMix, and also enabled the PTZ controls and Tally. Our only problem is that the tally lights don't work well. Sometimes when another program input is live, the new and the old tally lights are on at the same time, or sometimes it is lagging before the tally light turns on. The protocol we enabled in PTZ controls is Sony VISCA, as this is also provided by the PTZ cameras.

Can you help us to get the tally lights working correctly?