I made the mistake of helping out a friend with a customer that has a Siemens Hicom 120. The backup battery was loose and he powered it off. Doh! As it turns out this was one of my old customers and I have a copy of the orginal install on my PC. But I can't interface with ther PABX. I remember there was some quirky serial pinout, so can anyone tell me what it is?
Thankyou Peter