Can these devices work with elk?

Anyone know the interface the ELK temperature sensors use? I believe it is some kind of basic numeric encoding transmitted by pulses on a zone input. If you watch the light on the sensor you will see it flash on/off while transmitting the code. Probably pretty easy to build a circuit to interface any temp sensor as if they are ELK temp sensors. I might just buy one to check this out.
 
Hmm, this opens the door to using the "temperature" sensor readings to display all kinds of numeric data. I must now go probe the limitations of this!
 
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