Open or close dry relay contacts based on presence or absence of video
The VPS-2RC Relay Contact Output Video Controlled Switch senses the input video sync-tip amplitude to automatically switch a rear-panel three-position terminal block with common, normally-open, and normally-closed dry contacts. The input signal toggle threshold and loss of signal relay switch delay time may be adjusted by internal control. The loopthrough input allows this unit to be easily inserted in the line between the signal source and destinatination.

Specifications
Switch Level - 0.05v to 0.286v sync-tip
Input Impedance - Greater than 10k ohms
Input Signal - NTSC video or black burst
Switch Off Delay - 3 to 40 seconds (adjustable)
Connectors - BNC
Power Requirements - 12 to 24VDC negative ground or 12 to 24VAC, less then 100ma
Dimensions - 4.25"w x 1.75"h x 12"l (quarter rack width)