[Elecraft] Long RS232 Runs - RS422

[WILLIS COOKE]

The old criteria was 50 feet, but that was set before the specification for any twisted pair for digital, let alone Cat 5.  In short, it it works well, it is OK but 200 feet sounds reasonable.  RS-232 uses a 5 volt signal level.  RS-422 uses a higher signal level, I believe 12 volts, but that is from memory.  Watch out for the serial dongles that plug into USB ports.  Some are not full RS232 and do not work except with certain connections, ham radio applications not included.  Be careful and if it does not work, keep trying different dongles or get on the internet and find the brand and source for one that will work.  If all else fails or if you want to be sure, buy a card based RS-232 or 488 interface that uses all DB-9 or DB-25 connectors.   Willis 'Cookie' Cooke,VP of Tidelands ARS and TXPE K5EWJ & Trustee N5BPS
 

      From: Jim Brown <jim at audiosystemsgroup.com>
 To: elecraft at mailman.qth.net 
 Sent: Thursday, January 21, 2016 12:44 PM
 Subject: Re: [Elecraft] Long RS232 Runs - RS422
   
On Thu,1/21/2016 10:32 AM, Michael Walker wrote:
> I wanted to mention that for those that want long RS232 runs for devices
> (Steppir, Rotator, Elecraft Amp),

It helps to define "long." Distance for RS232 was originally defined in 
feet. Many years ago, it was redefined in terms of capacitance between 
conductors. Using cables as common as CAT5, lengths of 200 ft or more 
are no problem. Simply use one pair per signalling circuit.

73, Jim K9YC
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