Today's Message Index:
----------------------
1. 06:00 AM - Tripacer update (Bob Gibfried)
2. 10:41 AM - GPS Serial Data to Garmin GTX-327 Transponder (Matt Dralle)
3. 12:44 PM - Re: GPS Serial Data to Garmin GTX-327 Transponder (teamgrumman@aol.com)
4. 01:23 PM - Re: GPS Serial Data to Garmin GTX-327 Transponder (Doug McNutt)
Message 1
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Two schools of thought. Some owners like everything original and there are
a lot of shops rebuilding and restoring some of the original parts.
My personal Tripacer is being updated as well as I can without resorting to
all of the time and 337s necessary for a major conversion. New carter stack
panel, 60 amp alternator, led cabin lights, KMD 150 GPS, etc.
Would be interested in your updates.
Bob, Wichita
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| Subject: | GPS Serial Data to Garmin GTX-327 Transponder |
Listers,
I've tried sending two different sources of NEMA 0183 data at 4800/9600/19200/38400/57600
baud rates to my Garmin GTX-327 on both serial input ports 1 (db25
Pin 2) and port 2 (db25 pin 19), and configured for "GPS" input. But I don't
get anything on the 327 serial input test display. I have been successful at
getting AirData Z-format from the GRT EFIS at 9600 baud into either of the GTX-327
serial ports, so the ports are good. The GTX-327 just won't seem to see
the GPS data for some reason.
Am I doing something wrong? Has anyone else tried this successfully?
Thanks!
Matt Dralle
RV-8 #82880 N998RV
Message 3
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| Subject: | Re: GPS Serial Data to Garmin GTX-327 Transponder |
Call Jeff at (661) 949-8300
-----Original Message-----
From: Matt Dralle <dralle@matronics.com>
Sent: Fri, 2 Jan 2009 10:39 am
Subject: Avionics-List: GPS Serial Data to Garmin GTX-327 Transponder
Listers,
I've tried sending two different sources of NEMA 0183 data at
4800/9600/19200/38400/57600 baud rates to my Garmin GTX-327 on both serial input
ports 1 (db25 Pin 2) and port 2 (db25 pin 19), and configured for "GPS" input.
But I don't get anything on the 327 serial input test display. I have been
successful at getting AirData Z-format from the GRT EFIS at 9600 baud into
either of the GTX-327 serial ports, so the ports are good. The GTX-327 just
won't seem to see the GPS data for some reason.
Am I doing something wrong? Has anyone else tried this successfully?
Thanks!
Matt Dralle
RV-8 #82880 N998RV
Message 4
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| Subject: | Re: GPS Serial Data to Garmin GTX-327 Transponder |
At 10:39 -0800 1/2/09, Matt Dralle wrote:
>I've tried sending two different sources of NEMA 0183 data at
>4800/9600/19200/38400/57600 baud rates to my Garmin GTX-327 on both
>serial input ports 1 (db25 Pin 2) and port 2 (db25 pin 19), and
>configured for "GPS" input. But I don't get anything on the 327
>serial input test display. I have been successful at getting
>AirData Z-format from the GRT EFIS at 9600 baud into either of the
>GTX-327 serial ports, so the ports are good. The GTX-327 just won't
>seem to see the GPS data for some reason.
>
>Am I doing something wrong? Has anyone else tried this successfully?
I recently had experience with a Garmin 425 GPS (a tiny one not
really for aircraft use) that claimed to put out RS232 compliant
signals.
What I discovered, with an oscilloscope, was a signal level that was
"low" at about +150 mV and high at about +4.5 V with a fairly high
internal resistance that had problems at 1 mA output levels. Without
careful grounding at the pins of the GPS the +150 mV was even worse.
RS232-C, which is the only official RS232 spec I can afford right now
calls for a negative going level for the low value and Garmin simply
does NOT meet that. There are some newer RS232 specifications around
that might describe Garmin's output level but when I asked all I got
was "RTFM" and the PDF manual simply says RS232 compliant.
I placed a 1.5 volt dry cell in series with Garmin's output with a
polarity that subtracted 1.5 volts from all signals. The resulting
data stream went negative and was acceptable to the old Macintosh I
was working with at the time. Some USB to RS232 converters would
work and others would not.
You seem to be talking about the Garmin as a receiver rather than a
transmitter and I have no idea how well Garmin's "RS232 compliant"
receiver behaves. I do doubt that you will get an authoritative
answer from them.
--
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