A bit of a long reach this one, but I'm trying to 'emulate' a keypad for a Scantronic 8136 panel. I've got as far as identifying it using a 150bit protocol of what seems to be long and short pulses on the signal wire done through releasing the signal wire from ground and letting the panel pull it back up to +14v for a period of time 150 times synchronised by a clock.

I'm hoping to build on this so that I can control my antique alarm system from my phone!

Anyone have any further information on how this works, as my attempts to play back the pulses (I think) I've copied are ignored by the panel, so I'm missing something!

Unless you've found someone online that has RE'd the protocol you'll have to continue to work on this.

I have heard of people connecting onto a working keypad membrane grid with a SBC and controlling keypresses via software in this way.

Ultimately, people in the trade wouldn't be spending time doing this and would be upgrading for something modern and more fit for purpose.

Fine to play about as a DIY project but modifying stuff in this way wouldn't conform to the standards we are required to install to.

Yep, this is purely for educational/fun purposes, and it is absolutely my fallback to get a fibreglass pen, clean the via's and then electronically click the keys, however, first I'm wondering if there are any people on this forum who may have worked at this level at or around Scantronic?