Hmm here's a bit more info:
Pg 5, section 2.08, (e): The intercom is accessed by dialing a 2 digit intercom number.
I don't know if the first number would be 0 or 1. So I figured I'd try both. Some signal pins don't buzz at all, no matter what I do. Others (so far 0, 5, 7 and 9 will buzz). But here's the deal.
I press 0, then the station number 4 times. Works every time on the 4th push, on the pins I listed. I know this thing doesn't support 9,999 stations, but perhaps the KSU is configured for 20?
Off to do some more reading.
