Post by r***@gmail.comDoes anyone know what the Comms pins on a SCART connector do? Wikipedia
suggests that they might be "D2B" but I can find nothing on what that
is? Does anything use it? If so what for?
There have been loads of proprietary data standards using those pins. I'm
pretty certain our mid-80s "Audivision" Philips Monitor + Separate Tuner
combination (bit like the Profeel range) had an IR Receiver that could be
mounted either in the monitor or the tuner unit, and if mounted in the
monitor it squirted remote control data down the SCART in, I think, RC5
format.
A later, Matchline, Tuner+Amp module didn't have IR detection built in
ISTR - and required it to come down the SCART or be fed in via an RC5 phono
input. A(Annoying, as I had the tuner+amp but not a Philips monitor!)
Whether there was every a formal standard for the data carried by those pins
on SCART - or whether it was just a bit of prescient forward-planning to
allow differing data applications, I don't know.
AIUI they are used for the semi-intelligent TV->VCR links - where you can
record on a VCR the programme you are currently watching via the TV tuner,
without having to specifically set the channel on the VCR for example, or
where you connect a VCR to a TV, and the TV sends the tuning information it
is using to the VCR to synchronise channel numbers etc.
I think I2C, RC5 etc are all carried via this connection on varying bits of
kit. Not sure if Sony have used it to carry Control S - but I believe some
have used it to carry digital SPDIF audio.
Steve