using keypads without alarm panel

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using keypads without alarm panel

Postby edge9421 » Mon May 11, 2020 8:43 am

I'm researching feasibility of using my XL-4500SM keypads with Home Assistant and found this product. Although this product is the opposite of what I want do do, I am hoping some of the protocol knowledge will be useful for my project. My motivation for this project is that my wife is far more comfortable with conventional keypads than fancy tablets. There is also something nice about physical buttons and LED's.

I took my FBII XL21 alarm panel out of service when I bought this house a couple years ago and replaced it with a Konnected device to interface the wired sensors and siren with my Home Assistant. I still have the XL21 laying on my workbench in case I need it to reverse-engineer the signals, but avoiding that would be nice. From what few clues I have found so far, it seems like there is a chance this is an RS485 serial bus? I have an RS485 to USB adapter available to experiment with but wanted to get more info before attempting to connect it to the keypads or the XL21. I found this page with protocol info, but it's not obvious to me that's purely the Alarm Decoder software protocol or if any of that is the raw bus protocol, and whether this is RS485 or something else.

Any help with the raw protocol is greatly appreciated. Thanks!
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Re: using keypads without alarm panel

Postby edge9421 » Wed May 27, 2020 6:47 am

Does anyone have any thoughts on this?
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