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Serial connections in Parallel?

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wdleonard(at)gmail.com
Guest

Posted: Sun Oct 29, 2006 7:58 am Post subject: Serial connections in Parallel?

I am going to get a Garmin 396or496 and want to connect it's serial output to my SL/30 so it can program the frequencies.  I also want to connect it to my Navid, so the NMEA data can steer the auto pilot.  But the Garmin only has 1 serial out line. 

  

 The output on the Garmin is labeled as "NMEA and VHF" which makes me assume that the data stream has the NMEA data interposed with the VHF programming data.

  

 So the question for you smart guys is: If I connect the serial out signal from the Garmin in parallel to both of the devices, will it work or will there be some sort of signal degradation/interference?

  

 Thanks

 

-- 

David Leonard



Turbo Rotary RV-6 N4VY

My websites at:

http://members.aol.com/_ht_a/rotaryroster/index.html

 http://members.aol.com/_ht_a/vp4skydoc/index.html

http://leonardiniraq.blogspot.com 

  [quote][b]

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Larry Bowen

Joined: 09 Jan 2006
Posts: 802
Location: NC, USA

Posted: Sun Oct 29, 2006 8:19 am Post subject: Serial connections in Parallel?

I'm feeding both my SL30 and TruTrak with the single  output from my 396 with no probs.

 

-

Larry Bowen

Larry(at)BowenAero.com

http://BowenAero.com

  



 [quote]         From: David Leonard    [mailto:wdleonard(at)gmail.com] 

Sent: Sunday, October 29, 2006 10:58    AM

To: rv-list(at)matronics.com

Subject: Serial    connections in Parallel?

   

   I am going to get a Garmin 396or496 and want to connect it's serial    output to my SL/30 so it can program the frequencies.  I also want to    connect it to my Navid, so the NMEA data can steer the auto pilot.  But    the Garmin only has 1 serial out line. 

    

   The output on the Garmin is labeled as "NMEA and VHF" which makes me    assume that the data stream has the NMEA data interposed with the VHF    programming data.

    

   So the question for you smart guys is: If I connect the serial out signal    from the Garmin in parallel to both of the devices, will it work or will there    be some sort of signal degradation/interference?

    

   Thanks

   

-- 

David Leonard



Turbo Rotary RV-6 N4VY

My websites    at:

http://members.aol.com/_ht_a/rotaryroster/index.html

http://members.aol.com/_ht_a/vp4skydoc/index.html

http://leonardiniraq.blogspot.com    

 	  Quote: 	
		  



href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List



	
[b]

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_________________
Larry Bowen
RV-8 SOLD,
RV-7QB in progress...

Gary.A.Sobek

Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA

Posted: Sun Oct 29, 2006 8:20 am Post subject: Serial connections in Parallel?

What you are calling Parallel, we Electrical GEEKS call "Daisy Chain".  (yes 

it is parallel)



Yes it will work.  I have my GX60 Serial Port 1 "Daisy Chained" to the SL30 

and then to my Trio.  Everything works.  I tried using Serial Port 2 to run 

the Trio but the GX60 only allows me to program it with the correct output 

format to only one of the two ports. Therefore I would have been able to use 

serial data on only one of the two.



The only problem maybe that it is not the correct format for the Navaid.



Gary A. Sobek

"My Sanity" RV-6 N157GS O-320 Hartzell,

1,964 + Flying Hours So. CA, USA



----Original Message Follows----

From: "David Leonard" <wdleonard(at)gmail.com>

Reply-To: rv-list(at)matronics.com

To: rv-list(at)matronics.com

Subject: Serial connections in Parallel?

Date: Sun, 29 Oct 2006 07:57:31 -0800



I am going to get a Garmin 396or496 and want to connect it's serial output

to my SL/30 so it can program the frequencies.  I also want to connect it to

my Navid, so the NMEA data can steer the auto pilot.  But the Garmin only

has 1 serial out line.



The output on the Garmin is labeled as "NMEA and VHF" which makes me assume

that the data stream has the NMEA data interposed with the VHF programming

data.



So the question for you smart guys is: If I connect the serial out signal

from the Garmin in parallel to both of the devices, will it work or will

there be some sort of signal degradation/interference?



Thanks



--

David Leonard



Turbo Rotary RV-6 N4VY

My websites at:

http://members.aol.com/_ht_a/rotaryroster/index.html

http://members.aol.com/_ht_a/vp4skydoc/index.html

http://leonardiniraq.blogspot.com



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brian.kraut(at)engalt.com
Guest

Posted: Sun Oct 29, 2006 8:24 pm Post subject: Serial connections in Parallel?

You  can usually output one NMEA signal to two or three devices in parallel without a  problem.  Sometimes it gives problems, particularly when you are going to a  mix of RS-232 and optocoupler inputs.  Some devices also ground the  negative side of the input and some devices don't like that.

  

 I work  with NMEA every day and it is a strange bird.  The standard calls for an  RS-422 output, but an optocoupler input.  Some units have RS-422 outputs,  some have RS-485, some have TTL.  Some inputs are RS-422, some are  optocoupler, some are TTL, and some are RS-232.  Some have the negative  side connected to ground on the transmitter, and some on the receiver, and some  have neither.

  

 I  design ship electronics systems for my day job and we use these buffers when we  need to output to more than one device.  http://www.engalt.com/prod01.htm.   It is usually better to have a separate isolated output to each device.   The buffer prevents problems with one device loading down the output and causing  problems with other devices.  It also has completely independent buffered  outputs so if one shorts or has other problems it will not affect the other  outputs.  I manufacture the buffers so my highly biased opinion is that you  should use one.

  

 

Brian Kraut

Engineering Alternatives, Inc.

www.engalt.com   [quote]   --

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