OK, but how do I know what the 0V is?
In the instruction manual, there is only mention of four inputs: IP1, IP2 and IP3 (each one with one wire, for three partitions) and then a fourth one which is INH (the INH input does not inhibit alarms from IP1 but cancels the Follow Me number whenever the panel is unset). So, I don't see a 0V. Thanks for your further help!