Ingper

Thank you for the answer. I've done that circuit a lot of times when remote controlling CD:s from audio mixers etc. But I don't think it's that simple. I have no keys on my 760 that can turn event record on or off. For example, the REC button only seems to enable (immediate) manual recording, and the only (!) way to stop that recording is by disabling "Manual recording" through the menu. STOP key has no effect, and seems only to be used in playback mode. Maybe I was a little bit unclear - I want to inhibit all recordings when we are home, and have normal functionality (i.e. Event recording, not continuesly) when we are away and the burglar alarm are in armed mode. Hope there is a better way than simulate keystrokes to go through the menu.... (Yes, I have thought about cutting off the camera power when we are home. But it's not a nice solution) Any suggestions ?

Ok. I haven't checked the buzzer (it's disabled due to sleeping children ), but it doesn't release the alarm output relay or seems to do anything else either. I found a manual for AVC760-762, that differs from my user manual. It says that pin 14 is unconnected (page 51). Maybe I have a 760's without "Alarm reset" functionality . I have no problem making an electronic circuit - with or without a small CPU (i.e. PIC, AVR) - that can send some RS232 commands via the serial interface of DVR if that is the solution. But were can I find the protocol ? To be useful I think it must do something more than just simulate the keys on the front. (Because I'm new I'm not allowed to post a link to the manual above. The link to the manual is w*ww.securicorp.*com/cctv-downloads/avc760-762_manual.*pdf, delete the * in address) EDIT: I have now tested with buzzer enabled. Grounding pin#14 doesn't affect the buzzer on my AVC760....

I want to (automatically) disable the DVR/recordings when I'm home in a simple way, i.e. when my burglar alarm are in no-armed mode. I thought pin 14, "Alarm Reset" could be used for that. But it has no effect at all - the recording starts when triggered even when pin is wired to GND. I've also tried to ground pin 14 during an alarm, but still nothing happens - the alarm output relay will not reset, nor the DVR will stop recording. The cameras are trigged with motion detect. I have upgraded to last SW (from 2020 to 2030...) with no difference. Have I misunderstood the function of pin 14 ? Isn't the pin usable to disable DVR alarm functionality ?