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are twisted pairs necessary for RS-232?

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kenryan

Joined: 20 Oct 2009
Posts: 426

Posted: Thu Oct 09, 2014 2:01 pm Post subject: are twisted pairs necessary for RS-232?

Dynon Skyview uses RS-232 serial communication. Is twisted wire a requirement for RS-232? The installation manual makes no mention, other than for their "Skyview Network" which is separate from the RS-232 found in the harness.

  [quote][b]

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henry(at)pericynthion.org
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Posted: Thu Oct 09, 2014 3:13 pm Post subject: are twisted pairs necessary for RS-232?

Twisted pairs for RS-232 won't accomplish much.  If you twist RX and

TX together you'll be actively hurting the signal.  It's a

single-ended signal and can't take advantage of the common-mode

rejection provided by a twisted pair.

If you have signal integrity problems with it (and can't use the

differential equivalent RS-422) then shielded cable is probably the

way to go.



Henry



On Thu, Oct 9, 2014 at 3:00 PM, Ken Ryan <keninalaska(at)gmail.com> wrote:

 	  Quote: 	
		   Dynon Skyview uses RS-232 serial communication. Is twisted wire a

 requirement for RS-232? The installation manual makes no mention, other than

 for their "Skyview Network" which is separate from the RS-232 found in the

 harness.

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kenryan

Joined: 20 Oct 2009
Posts: 426

Posted: Thu Oct 09, 2014 3:32 pm Post subject: are twisted pairs necessary for RS-232?

Thanks Henry. My next question was whether or not it would be acceptable to splice the RS-232 wires. Specifically I would like to connect them to one side of a terminal strip, and then resume them from the other side. It sounds like that should not cause any problem?



On Thu, Oct 9, 2014 at 3:12 PM, Henry Hallam <henry(at)pericynthion.org (henry(at)pericynthion.org)> wrote:

[quote]--> AeroElectric-List message posted by: Henry Hallam <henry(at)pericynthion.org (henry(at)pericynthion.org)>

 

 Twisted pairs for RS-232 won't accomplish much.  If you twist RX and

 TX together you'll be actively hurting the signal.  It's a

 single-ended signal and can't take advantage of the common-mode

 rejection provided by a twisted pair.

 If you have signal integrity problems with it (and can't use the

 differential equivalent RS-422) then shielded cable is probably the

 way to go.

 

 Henry

 

 On Thu, Oct 9, 2014 at 3:00 PM, Ken Ryan <keninalaska(at)gmail.com (keninalaska(at)gmail.com)> wrote:

 > Dynon Skyview uses RS-232 serial communication. Is twisted wire a

 > requirement for RS-232? The installation manual makes no mention, other than

 > for their "Skyview Network" which is separate from the RS-232 found in the

 > harness.

 >

 >

 

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[b]

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henry(at)pericynthion.org
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Posted: Thu Oct 09, 2014 4:01 pm Post subject: are twisted pairs necessary for RS-232?

On Thu, Oct 9, 2014 at 4:31 PM, Ken Ryan <keninalaska(at)gmail.com> wrote:

 	  Quote: 	
		   Thanks Henry. My next question was whether or not it would be acceptable to

 splice the RS-232 wires. Specifically I would like to connect them to one

 side of a terminal strip, and then resume them from the other side. It

 sounds like that should not cause any problem?


	


Yes that should be fine.

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