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Resolved: Serial Communication With Security Panel

Added by theboozler over 4 years ago

I have the Ademco Vista-20p home security panel installed in our new home.

This is what it looks like http://www.alohaalarm.com/wp-content/uploads/2012/09/IMAG0351.jpg
Here is it’s wiring diagram: http://www.home-security-systems-answers.com/images/ademco-vista-20p-007.jpg

According to my research, others have had success listening in on serial comms based on a serial interface of RS-232-like at 4800, 8, E, 2 http://forum.arduino.cc/index.php?topic=200820.0

Should the attached circuit be sufficient to listen in on this security panel, should I use some more safety precautions? Or should I just go buy a RS232 to ttl converter? (though those only seam to just be level shifters anyway)
Has anyone here had any experience taping into there home security panel in order to make a DIY monitor?

Someone else has mentioned that the panel may be using rs485 rather than 232, any thoughts on that and how to check that?
link to discussion I started at arduino forum: http://forum.arduino.cc/index.php?topic=255297.0

schem.jpg (79.6 KB) schem.jpg
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Replies (1)

RE: Serial Communication With Security Panel - Added by theboozler over 4 years ago

For future reference:
Previously attached circuit worked fine to read data signal from Vista-15p security panel. Had to switch from hardware serial to software serial, this project, and the SoftwareSerial2 code they use are very helpful: https://github.com/markkimsal/homesecurity

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