I'm plan to interface a atmel avr with my alarm system in home but the issue is DSC has a propriatary protocol between the keypad and the base. So has anyone messed with this before or can give me a few beginners tips on how to reverse engineer this protocol? The wiring is simple: Vcc, GND, Data, Clock The Vcc is +12 volts and the data/clk lines are between +8-10 but work just fine through a voltage divider to the logic analyzer. The Clock line is confusing tho, its a 1kHz clock at 50% duty but only runs for 41. Expert Choice Terbaru on this page. 600ms then it goes high for 5.400ms and then starts over again. The Data line appears to change on on either rising or falling edge of the clock (0 is the Data line, 1 is the Clock line).

Dec 30, 2016 - >DSC2550 panel and LCD600 keypad. If you have *ANY* specs on any alarm >panels and there serial communications between panels and keypads please >send me email. The first reply to this thread is in error. Metodo Para Flauta Dulce Soprano Pdf. Here is the correct version: The DSC serial keypad link (which is used by most of their low.

There is no simple answer to decoding a protocol, if they have a good encryption scheme setup then you are probably going to be up &$%* creek. With some work and more questions you might successfully figure out the kind of encryption, and then, if it is poorly implemented, decode it. Chances are that the keypad has a very simple protocol and the controller has some strict constraints on how many button pushes it will accept and such. On the note of the synchronous protocol, chances are that the protocol is a.