99.9%, if not all alarms are triggered by a Neg signal, we still common up the Negs.I was probably only going for the smaller 8 relay Pyronix oem which I believe will need a separate psu with battery back up. As far as powering and triggering the vocaliser - are you saying that if I use a separate psu then it will trigger ok as long as the negatives from the panel and the external psu are commoned up? I cant get my head round that - at the moment the vocaliser is triggered by a -ve trigger??
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