We were working with CO Gaurdian, but between the two companies we never completed it. There doesn't seem to have been much demand, but we will start the communication again to see if we can add that support. So no promises, but we'll see what we can do.
At this point we don't really have the customer interest to spend the time doing a whole serial implementation (plus everyone will yell at us for not having enough serial ports even though we have WAY more usable serial ports than anyone else in this market).
We have a way to interface with it using the analog EMS inputs, since the devices output a voltage vs PPM. We discussed this with Ash but for some reason it never really got anywhere. If people are really out there and want this connectivity, we can discuss how to do it.