substitute

Hey! I design those devices! And our software isn't... well, okay. Maybe it is. But that is not my department. I have neither radio nor software, but if you are able to sniff and decipher the protocol (and it's probably a really simple protocol, given the age and the fact that it's serial), it shouldn't be too difficult (for me or a number of others on your friend list) to reimplement in a little OS X/Unix Open Source app.