VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 03-21-2012, 04:35 PM
rv9aviator rv9aviator is offline
 
Join Date: Jan 2005
Location: Arkansas
Posts: 1,505
Default Arinc signal?

I have a trutrak autopilot with GPSS steering capabilities but only have an SL-40 Com radio at present. I need to send an ARINC signal to the EFIS-Autopilot in order to be able to be able to intersect a waypoint without overshooting and correcting back to the new course. Is there a less expensive way to do this than buying an SL-30 nav com radio? I am not looking for ILS features or information for IFR flight just additional autopilot features with my TruTrak autopilot. Thanks
__________________
Jim Wright
RV-9A N9JW 90919 SoldArkansas
http://www.jimsairplanes.com
_______________________
"It's a brutal struggle for the biscuit."
Reply With Quote
  #2  
Old 03-21-2012, 04:42 PM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 16,311
Default

Do you have an EFIS???

My A/P is hooked to the EFIS, and not to the SL 40.

I can not think of a reason to connect the A/P to an SL 40.
__________________
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
  #3  
Old 03-21-2012, 06:05 PM
rv9aviator rv9aviator is offline
 
Join Date: Jan 2005
Location: Arkansas
Posts: 1,505
Default

Yes I have a TruTrak EFIS, but in order to get an ARINC signal and not just a simple serial signal from my GPS I would need something like an SL-30 or 430 nav-com instead of my SL-40 which will output the ARINC signal.
__________________
Jim Wright
RV-9A N9JW 90919 SoldArkansas
http://www.jimsairplanes.com
_______________________
"It's a brutal struggle for the biscuit."
Reply With Quote
  #4  
Old 03-21-2012, 06:40 PM
bcondrey bcondrey is offline
 
Join Date: Jan 2005
Location: Bellevue, NE
Posts: 552
Default

An SL-30 doesn't output ARINC, only serial. To use the GPSS you either need a box like a 430 or an EFIS that does internal conversions.

Bob
Reply With Quote
  #5  
Old 03-21-2012, 07:17 PM
Brantel's Avatar
Brantel Brantel is offline
 
Join Date: Mar 2006
Location: Newport, TN
Posts: 7,514
Default

What Bob said.

An SL-30 alone won't do it.
__________________
Brantel (Brian Chesteen),
Check out my RV-10 builder's BLOG
RV-10, #41942, N?????, Project Sold
---------------------------------------------------------------------
RV-7/TU, #72823, N159SB
Lyc. O-360 carbed, HARTZELL BA CS Prop, Dual P-MAGs, Dual Garmin G3X Touch
Track N159SB (KK4LIF)
Like EAA Chapter 1494 on Facebook
Reply With Quote
  #6  
Old 03-21-2012, 07:23 PM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 16,311
Default

My EFIS---GRT has an add on ARINC plug in module.

Maybe your TruTrack has one available too??
__________________
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
  #7  
Old 03-21-2012, 07:31 PM
rv9aviator rv9aviator is offline
 
Join Date: Jan 2005
Location: Arkansas
Posts: 1,505
Default

I was misreading the installation manual on the TruTrak Efis. The SL-30 serial output only adds NAV information to the EFIS Screen. It looks like the cheapest way out to get ARINC output is a Garmin 155XL, 200XL, or 300XL. Thanks for the info about the SL-30.
__________________
Jim Wright
RV-9A N9JW 90919 SoldArkansas
http://www.jimsairplanes.com
_______________________
"It's a brutal struggle for the biscuit."
Reply With Quote
  #8  
Old 03-21-2012, 09:06 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 8,159
Default

I think you're confusing two things.
ARINC is a digital standard that is used for some communications between avionics.
GPSS is "GPS-Steering" which is a signal which advises to start turns before a way point, to make the turn smooth with no overshoot.

GPSS signals are usually sent over ARINC lines. But not all ARINC signals have GPSS included.

I have a GRT HX, and it will send ARINC signals to the autopilot (I have a Trio) but it will not send GPSS signals unless it is also hooked up to a GPS like the Garmin 400W, 420W, or 430W, from which it actually gets the GPSS commands.

I don't know if the Garmin 300 radios send GPSS signals, or not.
Reply With Quote
  #9  
Old 03-22-2012, 04:59 AM
rv9aviator rv9aviator is offline
 
Join Date: Jan 2005
Location: Arkansas
Posts: 1,505
Default

According to the TruTrak manual there are pin outs on the 155, 200, and 300XL for ARINC signals. TruTrak does offer an ARINC converter but you still have to be connected to something like a 430. I think the converter just adds other features like VOR/ILS/LOC besides the GPSS steering.
__________________
Jim Wright
RV-9A N9JW 90919 SoldArkansas
http://www.jimsairplanes.com
_______________________
"It's a brutal struggle for the biscuit."
Reply With Quote
  #10  
Old 03-22-2012, 10:27 AM
bcondrey bcondrey is offline
 
Join Date: Jan 2005
Location: Bellevue, NE
Posts: 552
Default

I think you're getting closer. ARINC has support for a large number of data tags but not all of them are used by any given system at a given time. For example, on a 430W you can set ARINC output for VOR/ILS but that's simply sending that info out digitally (similar to what an SL-30 is doing with its seral out). You can also set the 430W to send GPS data in a variety of formats on the ARINC ports.

The EFIS systems to a varying degree ingest navigation/GPS data and then output it to the autopilot using ARINC. ARINC supports a richer set of data tags than the serial protocol which allows for turn anticipation, etc. The serial protocol essentially just sends a flightplan and position, and when the AP receives that data it will fly to the next waypoint and then turn to the next waypoint. So, the preferred way for an EFIS to communicate with the AP is via ARINC. Some EFIS systems will take nav data in and convert that internally to GPS Steering (GPSS) commands and then output that to the AP via ARINC. I'm hesitant to take a stab at what each EFIS brand does or doesn't do since it's a fast changing market. I know that GRT does this since I had a triple HX setup along with a TT AP, 430W and SL-30 in my last plane. Some other brands do this also but some don't.

As anothe poster said, you need to treat this as 2 different things - you probably want the ARINC interface for the EFIS since that allows the EFIS to communicate with the AP using GPSS (turn anticipation is a benefit). Communication with external navigation devices and what additional capabilities you'll get by doing that with ARINC will be EFIS dependent.

Hope this helps a little.

Bob
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 07:21 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.