SPC 5330 - Disable "DC Substitiution tamper" for a single zone only?

sebastiannielsen

I have a Vanderbilt SPC 5330 system.

On one of the zones, I have put a arduino microcontroller, using a pin to pull the zone HIGH or LOW. This is part of a home safe, so the microcontroller talks to the safe controller and also the zone board, and can pull the zone (and thus trip the alarm) if someone is doing "dubious things" with the safe. (for example, if bolt motor reports position "suddenly changes" without a authorized access being done)

However, when putting the pin HIGH in arduino microcontroller, SPC complains of "DC Substitiution Tamper" (of course because the SPC senses voltage coming into it).
Yeah, I know its a security feature to prevent a burgular from cutting the wire and then injecting DC voltage to bypass the EOL resistors.

However, that safe has the whole zone expansion board inside, so the wires are inaccessible anyways.

EOL is set to "None" for that particular zone (11 DÖRR 2). I are a "Engineer" of the particular system so theres no problems accessing every setting.

Any ideas?

Guess I need to do things slightly differently in the arduino? Preferably, I dont want to put in a big fat relay there as it pulls too much mA from the microcontroller.

altor

https://www.boards.ie/discussion/2058365467/spc-5330-disable-dc-substitiution-tamper-for-a-single-zone-only

Do you know how the zone itself is wired?

Have you a tamper connection for that zone also or just alarm?