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  #1  
Old 04-27-2022, 05:14 PM
graywoodworking graywoodworking is offline
 
Join Date: Dec 2021
Location: Merrimack
Posts: 2
Default Artex 345 self-test issues

When I run the self-diagnostic test on the Artex 345 I get 5 blinks, indicating that it is not receiving a GPS signal. The GTN 650 is seeing 10 satellites. I put an oscilloscope on the input pin to the Artex and I'm seeing a signal, so I'm pretty confident the wiring is good. I have the GTN 650 configures to transmit Aviation Protocol 1.

Anyone have any idea what could be wrong?
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  #2  
Old 04-27-2022, 05:25 PM
Canadian_JOY Canadian_JOY is offline
 
Join Date: Aug 2007
Location: Ontario, Canada
Posts: 2,530
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Remember your Artex 345 had to be programmed to receive one particular RS232 serial data protocol. Make sure the programming of the ELT indeed matches that of the GPS, with Aviation Protocol, as well as having the correct speed (baud rate).
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  #3  
Old 04-27-2022, 07:08 PM
graywoodworking graywoodworking is offline
 
Join Date: Dec 2021
Location: Merrimack
Posts: 2
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I called Artex and they looked up the serial number and confirmed that it was programmed for 9600 baud.
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  #4  
Old 04-27-2022, 10:03 PM
blaplante blaplante is offline
 
Join Date: Jan 2010
Location: Southern California
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9600 baud is the speed. The protocols might not be matching.
A bit like saying send the morse code at 10 words per minute (sets the speed), but the guy is sending in French and you expected English. There are several different protocols (dialect, language) used for GPS data. The Garmin GPS supports a few different ones in the setup.
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  #5  
Old 04-27-2022, 10:35 PM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
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Default Just me

I had to move my digital source from the GDU460 to the GNX375 because of this. But first i checked with my ELT supplier to ask them what format it was programed in. In my case it was Aviation Format 1.
When I moved it to the GNX375, I also had to move other GNX375 ports around because only a few ports had the option of outputting aviation format 1. It was a bit of musical chairs.
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  #6  
Old 04-28-2022, 07:26 AM
lr172 lr172 is offline
 
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Location: Schaumburg, IL
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Quote:
Originally Posted by blaplante View Post
9600 baud is the speed. The protocols might not be matching.
A bit like saying send the morse code at 10 words per minute (sets the speed), but the guy is sending in French and you expected English. There are several different protocols (dialect, language) used for GPS data. The Garmin GPS supports a few different ones in the setup.
If I remember correctly for the Artex, 9600 baud means it is expecting aviation format data and 2400 baud means it is expecting NMEA format data. Be sure your GPS is sending data in aviation format.

Larry
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