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  #11  
Old 12-31-2020, 04:40 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
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BTW, most will tell you, GRT has great products but lags behind in documentation. Here’s a tip: you can use the more complete, ‘legacy’ HX manuals (3 of them) for nearly everything. The internal software is pretty much the same. That’s where I found the ‘aviation’ format specified for a 430.
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  #12  
Old 12-31-2020, 04:50 PM
BobTurner BobTurner is offline
 
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Location: Livermore, CA
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Quote:
Originally Posted by macflyer View Post
Where do I designate the Garmin at? I thought the ARINC once hooked up and working would push the GPS signal to the GRT Horizon?
No, for all functionality you need both. The basic gps info travels over the RS232 network, while gps approach data goes over the arinc network.
Get into the gps set up menu (probably need to boot up while holding some button down). (It may not be in your manual-Garmin tends to not publish this stuff, because you can screw things up). Once there, navigate to the RS232 set up pages, find the specific port (1,2, etc) that you are using to send data to the efis, and set speed/baud rate to 9600, format to ‘aviation’. Turn the unit off, then back on, to save the changes.
The same secret set up menu is also where you set the arinc out to low speed, gamma format.
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  #13  
Old 12-31-2020, 04:52 PM
macflyer macflyer is offline
 
Join Date: Nov 2019
Location: Fishers, IN
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I am not for sure, "IF" I have the RS232 going direct to the GRT EFIS. I believe the RS232 is going into the ARINC. Yes, GRT certainly lacks on some of their information when it comes to the technical side!
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Last edited by macflyer : 12-31-2020 at 05:07 PM.
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  #14  
Old 12-31-2020, 06:34 PM
BobTurner BobTurner is offline
 
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Quote:
Originally Posted by macflyer View Post
I am not for sure, "IF" I have the RS232 going direct to the GRT EFIS. I believe the RS232 is going into the ARINC. Yes, GRT certainly lacks on some of their information when it comes to the technical side!
Okay, that won’t work. RS232 and ARINC are two different - both hardware and software - systems for sending data from one box to another. They are not at all interchangeable. I’d suggest you download and read thru the grt HX manuals (installation, set-up, user) before going too much further.
Typically each box will have several RS232 ‘ports’. Each port will have one ‘in’, one ‘out’. Each in and out can be assigned its own ‘format’, but typically there is only one speed (or baud rate) for both. So figuring out which port will be used for what takes some thought and layout. It’s not hard to run short of ports. The format of an ‘in’ must match the format of the ‘out’ that it’s hooked to, although sometimes different format names are compatible (no one said this is easy). Best to follow the recommendations in the manuals. RS232 uses the aircraft ground as a signal return line.
ARINC is electrically different. It has two wires (A and B, always connect A to A, B to B, when connecting two different boxes).
With both RS232 and ARINC, one ‘out’ can drive several ‘ins’; but each ‘in’ can only be hooked to one ‘out’.

Last edited by BobTurner : 12-31-2020 at 06:52 PM.
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  #15  
Old 12-31-2020, 07:03 PM
h&jeuropa h&jeuropa is offline
 
Join Date: Jun 2008
Location: Kalamazoo, MI
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There is a GNS 430/530 supplement on the GRT site that will help. It is at
https://grtavionics.com/media/GNS430SupplementA2.pdf

Jim Butcher
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  #16  
Old 12-31-2020, 09:28 PM
macflyer macflyer is offline
 
Join Date: Nov 2019
Location: Fishers, IN
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Thanks everyone! I will get to the airport tomorrow and check recheck everything! Cheers and Happy New Year!
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  #17  
Old 01-01-2021, 06:08 AM
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Foghorn Foghorn is offline
 
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Location: Virginia Beach
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I just went through this with my GPS 175, GRT ARINC and Sport EX. This is what GRT sent me to get it working correctly.

GPS175 Settings:

ARINC RX Port 1:
Format: EFIS/ADC
Speed: Low

ARINC TX Port 1:
Format: GAMA Format 1
Speed: Low

RS232 Port 1: Aviation Output 1

The 175 does not have an RS-232 Fuel/Air Data (FADC) input like other Garmin IFR GPS units.

EFIS Settings in SET MENU, General Setup:

For units with external ARINC module: ARINC Module Connected: Yes, Port (select port it's wired to)

ARINC Receive Rate: Low
ARINC Transmit Rate: Low

Serial Port 3 Rate: 9600
Serial Port 3 Input: GPS1 Aviation/MapCom
The Serial Port Output is not used for the 175 and can be used for unrelated functions at 9600 baud.
Using GPS1 for the GPS175 is recommended and sometimes required. Change any other GPS to GPS2.

If the ARINC module is connected to port 6, the settings would look like this:
ARINC Module Connected: Yes, Port 6

Other settings in General Setup:

ARINC GPS Input: GPS1
This tells the EFIS to use the GPS data from the ARINC-429 connection when GPS1 is selected.

NAV Mode Source: Internal
The GPS175 does not have a built-in VOR/ILS receiver, so all mode changes must be done in the EFIS.

GPS1 Flight Plan Source: External
This tells the EFIS to use GPS flight plan data from the GPS175 RS-232 connection.

GPS2 Flight Plan Source: update this to match your GPS2, if any.
GRT GPS units should be Internal. GPS units that transfer flight plan data should be External.

Virtual GPS2: Normally Off unless you know you want this feature.
If you have two GPS inputs this must be Off.

Settings in SET MENU, Primary Flight Display:

To enable the approach modes and PFD indicators, you must configure the ILS display:

ILS Type: pick Needles or Scales as preferred
When some other features are turned on, only Scales mode is possible.

Show VOR CDI on Localizer: No, unless you have a VOR input.

Show GPS CDI on Loc/GS: Yes
This displays the GPS approach deviations on the ILS indicators.
This is required for the GPS approach display and capture modes in the EFIS.

Hopefully this helps.
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  #18  
Old 01-01-2021, 04:58 PM
macflyer macflyer is offline
 
Join Date: Nov 2019
Location: Fishers, IN
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Default Thanks for all your help!

Thanks for all the help! I did not have an RS232 from the Garmin 175 ran to a serial input in the GRT Horizon EFIS. Once I ran the from the 175 to the serial port on the EFIS, I powered everything up and had GPS signal and Map!

Have a great New Year! Blue skies!
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  #19  
Old 01-01-2021, 05:02 PM
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Mike S Mike S is offline
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Good for you, thanks for reporting back with the solution to the issue----might help someone else in the future.
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