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Thank you for replying and for the info on the pressure plates and sensors. The intercom is wired and does exactly as you describe. What it doesn’t explain is why it worked fine yesterday and then stopped working the next day.

Hi, I wonder if anyone can help. Probably more of a gate question but using the Hikvision intercom. Yesterday I replace a analogue GSM gate intercom system with a Hikvision IP intercom. In addition to the intercom there are safety sensor on the post and an approach pressure plate of some sort...