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edchristian(at)knology.ne
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 Posted: Sun Aug 31, 2008 2:35 pm Post subject: D-100 Encoder Help |
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Just rewired new instrument panel in RV-6.
Everything works except the altitude encoder?
Dynon D-100 EFIS (using this as encoder)
From the DB25 PIN #13 goes out and splits to:
1. Garmin 300XL Nav/Comm for altitude input - goes to
pin 17 (RS 232 input)
2. To Dynon Altitude Encoder Converter (to grey scale)
then to King KT-76A Transponder (Grey Code connections)
Anybody have experience with this setup? Does anyone know the
specific settings in D-100 and Garmin 300XL I need to change?
Thanks,
Ed
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walstroom
Joined: 24 May 2008
Posts: 3
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| Posted: Sun Aug 31, 2008 3:20 pm Post subject: D-100 Encoder Help |
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Did you check your baudrates ? 9600 bps.
--------------------------------------------------
From: "Edward Christian" <edchristian(at)knology.net>
Sent: Monday, September 01, 2008 12:34 AM
To: <aeroelectric-list(at)matronics.com>
Subject: D-100 Encoder Help
| Quote: |
<edchristian(at)knology.net>
Just rewired new instrument panel in RV-6.
Everything works except the altitude encoder?
Dynon D-100 EFIS (using this as encoder)
From the DB25 PIN #13 goes out and splits to:
1. Garmin 300XL Nav/Comm for altitude input - goes to
pin 17 (RS 232 input)
2. To Dynon Altitude Encoder Converter (to grey scale)
then to King KT-76A Transponder (Grey Code connections)
Anybody have experience with this setup? Does anyone know the
specific settings in D-100 and Garmin 300XL I need to change?
Thanks,
Ed
|
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nuckolls.bob(at)cox.net
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| Posted: Sun Aug 31, 2008 5:51 pm Post subject: D-100 Encoder Help |
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At 06:34 PM 8/31/2008 -0400, you wrote:
| Quote: |
<edchristian(at)knology.net>
Just rewired new instrument panel in RV-6.
Everything works except the altitude encoder?
Dynon D-100 EFIS (using this as encoder)
From the DB25 PIN #13 goes out and splits to:
1. Garmin 300XL Nav/Comm for altitude input - goes to
pin 17 (RS 232 input)
2. To Dynon Altitude Encoder Converter (to grey scale)
then to King KT-76A Transponder (Grey Code connections)
Anybody have experience with this setup? Does anyone know the
specific settings in D-100 and Garmin 300XL I need to change?
|
When you use one encoder to drive more than one load,
it's customary to isolate the two loads from each other
by means of a set of diodes in each data line wire from
each load. Transcal encoder installation manuals talk
about this. See pages 37 and 38 of
http://www.trans-cal.com/882189rA.pdf
Given that the KT-76 is not a "modern" device, I suspect
leads out of the King transponder would benefit from
addition of diodes. 1N4148 or similar have been used
with success but a Schottky diode is preferred. See
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=SD101CDICT-ND
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=497-2493-1-ND
Check the Garmin manual for "diode isolation" of the
encoder data leads . . . or call the factor. It MIGHT
need them too.
One way to confirm that diode isolation is a viable avenue for
investigation is see if the two users of altitude information
work with the other user disconnected.
Bob . . .
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rockyjs
Joined: 08 Oct 2007
Posts: 7
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| Posted: Mon Sep 01, 2008 7:49 am Post subject: D-100 Encoder Help |
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Ed,
I have virtually the same setup except a Dynon D-180. The Dynon install manual has you set the Altitude output to !:
<![if !supportLists]> <![endif]>The EFIS Altitude Encoder format must be set to format number one. To change this setting, from the main menu, select: MORE > SETUP > MORE > ALTENC. Press FRMAT until it reads “1.”
Set to output 1 my King KT76A is working fine with respect to ATC.
The Garmin 300XL gives you two choices for serial altitude input: Icarus-alt and shadin-alt. Neither of which is compatible to the Dynon serial output of “1”. I did have the Dynon output set to “4” which worked on the 300XL, but wouldn’t allow the Transponder to work. Maybe there is a workaround to this problem using the serial stream? You could always feed the 300xl with gray code split from the Dynon serial encoder.
[quote][b]
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