On Jan 8, 2012, at 11:45 PM, David J Taylor wrote:
Chris, it also occurs to me to enquire exactly how the RS-232 data is
being carried over the cat-5 cable. What is the wiring?
Searching for "RS232 over RJ45" suggests the standard pinout is known as
EIA/TIA 561.
Basically, it closely resembles the EIA/TIA 574 (DB9) wiring, but DSR
and RI have been combined.
Regards,
--
-Chuck
I was expecting that, for timing purposes, the four pairs would be used
as:
- TXD/ground
- RXD/ground
- DCD/ground
- unused
i.e. that every relevant RS-232 line was carried with a ground on the
twisted pair. This would be better than some random "pushing of pins"!
Cheers,
David
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