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 41.600ms 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). 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. Craig Shaw Gardner Lost Boys Ebook Download. That is my best informed guess based on your explanation. I cannot open the files right now, but I hope this helps. The fact that it changes on both clock edges is just a sign that both clock edges represent a point that a 'bit' of data occurs.

DSC Serial Integration Module RS2. Serial Interface. The DSC IT- 1. 00 is an integration module used for connecting DSC alarm systems to HVAC, automation and other. The DSC IT100 provides an RS232 serial connection that can be either connected. This protocol is used for. DS-MPE-SER4M Serial Port RS232/RS422/RS485 Protocol Selection Software User Manual. Jul 27, 2012 - If you have a DSC PC1500RK control panel [CaitSith2] shows us how easy it is to control the buttons, LEDs, and buzzer. If you've got. The code is to interface a DSC PC1500RK alarm keypad. If the key was pressed successfully, its character is output on the serial line, at 115200 bps. Mar 4, 2011 - I am trying to understand this protocol that my DSC 1555 alarm uses between the base and the keypad, but issue is its propriatary of some sorts. Serial. Download Mark One Exact Ce Lipseste on this page. println(msg); udp.beginPacket(IPAddress(192,168,1,2),1234); String stf = formatSt(stc); stf.toCharArray(buf,100); udp.write(buf); udp.write(10); udp.