Summary
The AX-084C and AX-248C have open collector outputs to trigger a recording device when there is a video signal present on the V1 and V2 video outputs. The open collector outputs labeled VCH1 and VCH2 can be used in conjunction with the RY-24L relay. The diagram below shows this connection. If the recording device supports an open collector trigger, then the RY-24L is not required. The video signal on V1 and V2 are not full-time and correspond to the talkpath used. (If door station is using audio talkpath 1, video will be present on V1. When using audio talkpath 2, video will be on V2. User cannot select which talkpath is used.) Even in a single master system, both V1 and V2 will be used.
Wiring Diagram
