a. The Vista-21 iPSIA is just a Vista-20 with an IP communications board that speaks specifically SIA protocol.
b. as Tony mentioned, it uses the CBM module, which I've heard is not great - we've always had the Security contractor upgrade the panel to a 128BPT which has the serial port built onto the main board...
Tony, What is your recent experience with the Vista-20 and the CBM module, particularly if you've compared it with the 128/250BPT systems?? ?TIA!!
