A bit of background : Spread over my bench at the moment are the insides
of an HP11284 Data Communication Interface for the HP9830. This is a
somewhat nice-for-the-time unit that does async and sync protocols, etc..
Anyway, as well as the RS232 interface to a modem, it also has an 'RS366'
interface to an ACU (Automatic Calling Unit?). From what I've managed to
discover so far, this is an interface for autodialers, it uses a DB25
connector, 'RS232' voltage levels (in fact the HP11284 uses 1488s and
1489s to talk to the RS366 connector).
A goolge search for RS366 provided me with a pinout (which I had anyway)
and brief descriptions of the signals. But I'd like more :-).
In particular, does anyone know a free (or relatively cheap) more
complete spec. I;d like to know the timeing of the various handshake
signals, and the encoding of the 4-bit digit-to-dial lines (it's not even
obvious that '0' is sent as 0000...).
What would be _really_ nice would be the schematic of an old
(pre-microcontorller [1]) ACU with an RS366 interface. I don't suppose
anyone knows of one.
]1] Since the HP11284 dates from 1974-ish, I would guess the RS366
interface is even older, and that discrete-logic implementations of the
ACU must have existed.
-tony