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                           AeroElectric-List Digest Archive
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                     Total Messages Posted Fri 11/10/17: 1
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Today's Message Index:
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     1. 06:27 AM - Re: RS-232 and Navworx  (Robert L. Nuckolls, III)
 
 
 
________________________________  Message 1  _____________________________________


Time: 06:27:24 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: RS-232 and Navworx

At 04:39 PM 11/8/2017, you wrote:
>
>Might be worth noting that NMEA0183 uses the EIA-422 (sometimes 
>known as RS-422) not RS-232.

   NMEA0183 is a digital language that can be conveyed
   on RS232, 422, 485, fiber optics or even bluetooth.

   The "RS" conventions speak to voltage levels, and
   transmission lines and are totally independent
   of 'language'.

   RS232 is a single wire signal operating against ground
   that swings above and below ground to represent "1"
   or "0". That voltage may be as high as +/-12 volts
   but I've built systems that ran quite happily on
   +/-5v.  I had one project that ran +5/=12 . . .
   the exact voltage is not critical, it's he
   transition from + to = and vise versa that carries
   the information.

   RS422 is a balanced pair of wires where the signal
   polarities alternate between the two wires. RS422
   transceivers generally operated in the 5v world so
   the voltage between the two lines is generally 5v
   with data being carried on polarity reversals.

   There are integrated circuits designed to translate
   422>232 or 232>422 . . . either convention can
   carry NMEA0183 messages . . . or any other
   protocol.


   Bob . . . 

 

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