The flaw is naming them "transmit" and "receive." "DTE2DCE" and vice
versa might have been a better choice so many years ago. "Data
Terminal" and "Data Communications" were probably equally poor naming
choices, but it seemed so obvious then.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 7/8/2018 6:21 PM, Don Wilhelm wrote:
Andy,
No TXD is TXD all the way through the path. Yes, the DTE TXD will
have the drivers, and the DCE will have receivers, but it is TXD from
end to end. RXD is the other way around because the DCE drives that
line.
Trsnsmit and receive are named with respect to the DTE.
73,
Don W3FPR
On 7/8/2018 8:39 PM, ANDY DURBIN wrote:
"TXD is really pin 3."
One end's TXD is the other end's RXD. That's obvious to those who
have used RS-233 for a while but if someone needs to ask then it may
not be obvious. Find the TXD pin on the source and connect it the RXD
pin on the destination. Sometimes it's easier to look with a scope
than to try to understand the documentation.
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