German EAK alarm system using 485 protocol - any clues?

Posted on
Sun Oct 14, 2018 1:45 pm
c64 offline
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Location: Germany

German EAK alarm system using 485 protocol - any clues?

We have an 18 year old german EAK alarm system that I can see uses 485 serial for communication between the control panels and the main unit. I would love to monitor the zones in Indigo. Does anyone have a clue on how I could go about that? Short of that, I'm seriously considering wiring directly in to the control panel LED's and connecting to an easyDAQ! :)

Posted on
Sun Oct 14, 2018 2:53 pm
lanbrown offline
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Joined: Sep 26, 2017

Re: German EAK alarm system using 485 protocol - any clues?

RS-485 is just the transport. You would still need to know what the bits mean and that could be proprietary to that alarm panel vendor.

There are several plugins for alarm panels and they require the use of a serial interface (RS-232) but the plugins are not compatible.

Once you figure out how the panel communicates, then you would need to add an RS-485 interface to Indigo.

Posted on
Mon Oct 15, 2018 12:58 am
c64 offline
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Re: German EAK alarm system using 485 protocol - any clues?

Gotcha - thank you! Looks like I'll be wiring into the LEDs then...

Posted on
Mon Oct 15, 2018 6:13 am
MartinG offline
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Joined: Aug 19, 2016

Re: German EAK alarm system using 485 protocol - any clues?

I have a USB-RS485 cable reading data streams from my alarm system. I've had little success decoding the full format, but it's ASCII and there are enough plaintext messages to the keypad to discern the basics of what's going on (eg set, part set, timed set, unset etc)

Just make sure you don't write characters to the RS485 interface, otherwise you could corrupt the data stream and/or trigger the alarm.

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