Interestingly, the RTS envelope on the Oxford chips is
implemented with... the DTR pin. On our cards we have a piece
of hardware which redirect the uart DTR pin to the external
RTS in this case.
Well, that's just plain wrong. The RS-232 standard was quite
clear that RTS is what's used to enable transmission. ;)
Believe it or not, it actually has a purpose. That way you can use
RTS/CTS hardware flow control AND have RS485 driver control using the
DTR pin.
Matt Schulte
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