The current evolution of the RS-232 spec also now contains a pinout
for an RJ-45 8-pin modular connector. This connector is becoming very
popular in the telecom industry for serial port connections because
of its size. RJ-45s allow much high panel density that DE9
connectors, even though they have the problem of being the same as
those used for ethernet connections.
On Jun 20, 2006, at 9:18 PM, Ron D'Eau Claire wrote:
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
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