[Elecraft] What's wrong with Serial

[Dave Mueller]

The latest copy of the spec I had was EIA-232-F.  It did not specify the 8 pin modular connector.  EIA-561 covers the 8 position modular plug when using it in an EIA-232 compatible system.  RJ-45 (Registered Jack) is defined in FCC part 68 and is a whole other ball of wax!

Dave AA3EE

>From: Jack Brindle <jackbrindle at earthlink.net>
>Date: Wed Jun 21 11:43:38 CDT 2006
>To: Ron D'Eau Claire <rondec at easystreet.com>
>Cc: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] What's wrong with Serial

>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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