Need serial pinout for Siemens Hicom 120

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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



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