Hello Bob,
I have hooked up an interface with a wall box that is set up to connect to connect as a R-80S to R-83 using a 4-06372-03 interface and this works fine, selects A side and B side selections.
When you posted your original message regarding did you say that the serial led was not lit? also did you have the loom in the interface at connection P601 that connects into the R-86 CCC in P-103?
Also what connections are you using on TB601 on the on the interface. You only need to connect to clock & Data and you must connect a 28 Volts AC connection and ground direct to the wallbox, do not expect to get 28volts at the marked connections at TB601.
If you require any further information please contact me off of line.
Regards
Alan
Alan Hood
ami-man
UK
alan-hood@datex.co.uk