cool. looks like tiny alun/grub screw underneath. i'll bring in a presc driver set tomorrow to get at it. in the meantime is it worth me putting a pic of the unit in here ? to make sure we're talking about the same beast?
Well at first I thought is was a BST Door phone with their logo.
That is the Door Phone itself and not the controller.
Normal wiring setup:
KSU/BCM 1 pair to Controller - (both in phone room)
Controller 2 pairs (24 volt and signal) to Door Phone
Door Phone 1pair (24 volts) to Door Strike
BST Door Phone uses digital signal just like a phone set
Analog Door Phone uses a Trunk or Analog port.
The Controller might be built in to the Analog Door Phone
Best to get the part number somehow, I tried to search via image but your picture turned up with a rainbow right smack in the middle so 1 couldn't do that.
Firebird might drop by soon whom is familiar and worked for BT, perhaps he knows this particular one, seems BT made a few.
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