[Elecraft] What's wrong with Serial

[Ron D'Eau Claire]

Mike W8UR wrote:

RS-232 has always specified a cable pinout; originally on an unspecified 25
pin connector.

-----------------------------------

Okay, you made me go look. When I first encountered the RS-232 interface,
IBM had not yet built the first "PC". 

Bob, W7AVK kindly forwarded to me a URL containing the info:

http://www.interfacebus.com/Design_Connector_RS232.html#b

Or 

http://tinyurl.com/zgnvp

So the specification does contain a connector pinout for DB-9 and DB-25
connectors. 

That makes it all the more important to heed Don Wilhelm's observation: all
DB-9's or DB-25 connectors do not carry RS-232 signals as described in the
specification. One might assume a DB-9 or DB-25 does carry RS-232 signals
with some assurance if it says "RS-232" next to the connector, but not when
it says "AUX I/O" or anything else next to it.

Ron AC7AC