[Elecraft] What's wrong with Serial

[Jack Brindle]

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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- Jack Brindle, W6FB
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