On 22 Feb 2005 09:35:39 -0800, "Alan"
wrote:

Hi,

Does anyone here know if it is possible to add a second handset to an
existing BPT door entry system?.

Usually, yes.

My friend has a duplex flat and it is a pain having to keep going
downstairs.

Looking at the BPT web site, it looks like he has a C/200 but I have no
idea if it is analogue or digital. The flat is 7 years old and there
are only 5 flats in the block

Probably analogue.

If so, any tips for doing it? I'm hoping it is a simple case of wiring
another one in parallel with the original one.

Terminal 5 will be the common negative
Terminal 7 is the call signal
Terminal 8 is Audio signal to handset
Terminal 9 is Audio signal to Door panel

The key terminals are, natrurally a push to make pair,

I've looked on the BPT site - there are wiring diagrams there but no
way of identifying which one corresponds to which model.

Try http://www.bpt.it/ut/schemari/L841004X01.pdf