Avidyne TAS on G600 ARINC 429 issue

[Jim Burns]

TAS620/G600 install trying to stay away from gray code.

We're installing an Avidyne TAS620 using a Garmin GNS 430 as the control unit and initial display unit via RS232. So far, so good. Traffic is displayed correctly on GNS430 when it is taken out of GND mode.

All CVI laptop tests on TAS unit PASS.

We're also attempting to provide the TAS620 with altitude and heading info from the G600's GDU620 via ARINC 429 and pull ARINC 429 OUT of the TAS620 to display on the GDU620.

GDU620 429 port 3 (3a and 3b) High speed output General Purpose 1 to the TAS
TAS 429 TX 1 and 2 to GDU620 429 port 7 (7a and 7b) High speed input TRAFFIC
GDU620 Traffic configuration set to Avidyne/Ryan
GDU620 has the most current firmware update

Traffic page on GDU620 shows TAS Failed, Alerts page shows TAS Failed.
Data stream for 429 7 IN barely shows any data flow compared to the other 429 INs from the GPS units.

Confirmed all 4 pins involved have good continuity and are not shorted to ground or other pins.

Could we be creating a circular argument in the 429 IN and OUT connections of the GDU620 where we're asking it to provide altitude and heading for the TAS on one channel, and then asking it to display that information as well as traffic through another channel? No warnings or notations against this method in the IM.

Wiring diagram attached. Any ideas or thoughts are appreciated!

 

[FORANE]

Don't know but you might ask on Avidynes forum:
http://forums.avidyne.com/default.asp

 

[Piloto]

I got similar problem. On the Garmins ARINC 429 heading and altitude inputs have higher priority over analog inputs. If you are feeding the G600 or G620 with analog heading they will think that the TAS is the heading source and ignore the analog heading input. So now the TAS gets a static heading which is its own feedback. Try disconnecting 429 data to the TAS. Check also the discretes on the TAS. I found that the G430/530 ignore some of the 429 words that other Garmin displays consider. Display heading data is required to display traffic on the moving map but not on the traffic only page mode. Check on the TAS to see if it will take synchro heading.

José