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GPS Skyforce IIIC and Trutrak Digi Flight II

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Hans-Dieter Aue

Joined: 27 Jun 2006
Posts: 3
Location: Germany

Posted: Wed Dec 20, 2006 12:08 pm Post subject: GPS Skyforce IIIC and Trutrak Digi Flight II

Hi group,



I have an GPS Skyforce IIIC produced in 1999 with current software update. The GPS worked fine so far and I would like to connect it to a TT Digi Flight II in my RV10.



Has anyone experiences with that combination?



The Skyforce can speak both NMEA-0183 format (4800 baud, 8 data bit, 1 stop bit, no parity) and AR-NAV-Data format (9600 baud, 8 data bit, 1 stop bit, no parity) on the serial output.



In case of NMEA-format the sentences RMC, GGA and RMB are send out. I can show the sentence struture if it helps.



Can anyone light me up if this pair works together and if I am able to fly programmed flightplans on the Skyforce. All input appreciated.



Hans-Dieter

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_________________
Hans-Dieter Aue
Germany
N110GH (reserved)
40424
Panel and Wiring

wooody04(at)bellsouth.net
Guest

Posted: Wed Dec 20, 2006 12:27 pm Post subject: GPS Skyforce IIIC and Trutrak Digi Flight II

Hans, Why don't you contact True Trak.  They certainly be able to tell 

you yes or no and how to hook it up.



Jim Streit





Hans-Dieter Aue wrote:

 	  Quote: 	
		   



 Hi group,



 I have an GPS Skyforce IIIC produced in 1999 with current software update. The GPS worked fine so far and I would like to connect it to a TT Digi Flight II in my RV10.



 Have anyone experiences with that combination?



 The Skyforce can speak both NMEA-0183 format (4800 baud, 8 data bit, 1 stop bit, no parity) and AR-NAV-Data format (9600 baud, 8 data bit, 1 stop bit, no parity) on the serial output.



 In case of NMEA-format the sentences RMC, GGA and RMB are send out. I can show the sentence struture if it helps.



 Can anyone light me up if this pair works together and if I am able to fly programmed flightplans on the Skyforce. All input appreciated.



 Hans-Dieter



 --------

 Hans-Dieter Aue

 N110GH 

 40424

 Finish kit





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=82715#82715

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aerobubba(at)earthlink.ne
Guest

Posted: Wed Dec 20, 2006 12:54 pm Post subject: GPS Skyforce IIIC and Trutrak Digi Flight II

Hi All-



I've a friend with a problem (no, really...). He has an ICS Plus nav/com

that had been marketed by Wag Aero at one time. It is now malfunctioning,

and he would like to try to get it serviced. So far he's had no luck,

either through Wag or the Internet. Although not exquisitely intuitive to

use, it does have a lot of pretty neat and useful features, and I don't

blame him for trying to get it fixed. 

 

Does anyone on the list have any (constructive) suggestions?

 

glen matejcek

aerobubba(at)earthlink.net

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Hans-Dieter Aue

Joined: 27 Jun 2006
Posts: 3
Location: Germany

Posted: Wed Dec 20, 2006 1:37 pm Post subject: Re: GPS Skyforce IIIC and Trutrak Digi Flight II

Jim,

I would had do so, but I can't believe that TruTrak will test all the (older) GPS in the world with there products. So I thought I ask anybody who probabley figured this out. I would also be glad to hear any experiences on that matter.

Hans-Dieter

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_________________
Hans-Dieter Aue
Germany
N110GH (reserved)
40424
Panel and Wiring

peter.rees01(at)tiscali.c
Guest

Posted: Wed Dec 20, 2006 3:32 pm Post subject: GPS Skyforce IIIC and Trutrak Digi Flight II

Hans



If the unit you're referring to was made by Bendix King - the IIIc that is 

installed in an avionics tray and was called the CM-2000, I had the 

following observations when connecting it to our Trio EZpilot.



I believe that the baud rate specified by the NEMA protocol should be 4800 

but the CM-2000 is set to 9600 baud and cannot be changed - its quite 

possible that the autopilot you want to connect to may be configured to 

support this but you'd need to check with the manufacturers.



There are a few other problem with the CM-2000. Apparently , the GPRMB 

string is missing from the NEMA stream.



Also:

1. the track error field has provision for track error up to 999.99 miles. 

The other units have 99.99.

2. the magnetic variation field has provision for up to 359.99 degrees of 

variation. The other units were limited to 59.99



These differences may well confuse the string processing of your autopilot 

if its not able to adapt to the differences from the NEMA spec.



I guess the answer is to either contact the manufacturer and ask them to 

either affirm that their unit will definitely work with your GPS (or that 

they will modify it to), get a newer GPS (the CM-2000 is a good, colour unit 

and I'd hold onto it if I were you) or get an autopilot from TRIO whose unit 

definitely works very well indeed with the CM-2000.



regards



Peter

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