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Transponder/EFIS Gray code

 
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dean.psiropoulos(at)veriz
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PostPosted: Fri Feb 24, 2006 8:15 pm    Post subject: Transponder/EFIS Gray code Reply with quote

Thanks for the help Brian, I think you mis-understood my question on the
Gray Code connection to the transponder. You are correct that the SL70 has
both Gray code and serial encoder inputs. But.....my EFIS D10 is an
original production model and does NOT have an encoder serial data OUTPUT
like the newer EFIS D10-A model. So I have to use the Gray code signals out
of the EFIS to drive the transponder. The EFIS has "A", "B" and "C" Gray
code signals (out) which correspond to the transponder Gray code inputs with
one exception. The Transponder has one additional Gray code input labeled
"D4" but the EFIS does NOT have a "D4" output (I assume this extra input
allows the Transponder to encode and transmit higher altitudes than those
with just A/B/C inputs). In any case, my question is what to do with this
"D4" input at the transponder end. Is it ok to leave it unconnected
(floating) or do I need to connect it to a positive voltage or...to ground?
Can't find any direction in the manual so I assume leaving it float will not
cause a problem but would really like to know for sure. Sorry for the
initial confusion.

Dean Psiropoulos
RV-6A N197DM
Autocad-only the Radio Stack remains

----------------original message-------------------------
Quote:
From: Brian Lloyd <brian-yak(at)lloyd.com>
Subject: Re: Transponder/ RS-232

Quote:
I don't remember if the SL-70 accepts serial data in instead of gray code.
I *think* it does but I am not sure. If it does not you will need a
serial->to-grey-code converter to get the data from the Dynon to the

SL-70....


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mthomson(at)showmeproduct
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PostPosted: Fri Feb 24, 2006 8:45 pm    Post subject: Transponder/EFIS Gray code Reply with quote

Quote:
From my experience with other EFIS and encoder systems, just leave
unconnected. Your assumption is correct and it is used only for higher

altitudes.
--


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brian



Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

PostPosted: Sat Feb 25, 2006 9:11 am    Post subject: Transponder/EFIS Gray code Reply with quote

DEAN PSIROPOULOS wrote:
Quote:


Thanks for the help Brian, I think you mis-understood my question on the
Gray Code connection to the transponder. You are correct that the SL70 has
both Gray code and serial encoder inputs. But.....my EFIS D10 is an
original production model and does NOT have an encoder serial data OUTPUT
like the newer EFIS D10-A model.

Ah, you are correct. I was thinking that the D10 had serial but not grey
code output. It is all a matter of listening to the question. Wink

Quote:
So I have to use the Gray code signals out
of the EFIS to drive the transponder. The EFIS has "A", "B" and "C" Gray
code signals (out) which correspond to the transponder Gray code inputs with
one exception. The Transponder has one additional Gray code input labeled
"D4" but the EFIS does NOT have a "D4" output (I assume this extra input
allows the Transponder to encode and transmit higher altitudes than those
with just A/B/C inputs).

Correct. It adds one more data bit in addition to the 9 bits you already
have. It allows altitudes above 25,000'.

Quote:
In any case, my question is what to do with this
"D4" input at the transponder end. Is it ok to leave it unconnected
(floating) or do I need to connect it to a positive voltage or...to ground?

The transponder already has the necessary pull-up resistor at its input
so that if you don't connect the D4 input, it will automatically default
to a zero.

Quote:
Can't find any direction in the manual so I assume leaving it float will not
cause a problem but would really like to know for sure. Sorry for the
initial confusion.

No problem.
--
Brian Lloyd 361 Catterline Way
brian-yak at lloyd dot com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery


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Brian Lloyd
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+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery
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