REFLECTOR: Garmin 250XL Autopilot Interface

[Jim & Sharon Beck]

Hi Dennis,
Made the trip to the hangar today,  I have recently moved from Fallon NV to
Yucca Valley CA and have not been able to find the pro pilot installation
drawings I made. I did find my Garmin installation manual and found that I
used the pin 24  RS 231 out  1 pin and thepin 34 battery negative for
groounding.  I use the pin 17 & 19 RS 232 in and out on my EI fuel flow
meter.  On page 86 of the Garmin Pilots guide & reference there is some
information on setup for the channel 2 pin # 19.  the garmin installation
manual in section 4.2.2 I/O channel 1 only gives setup information for pin
24.

my garmin install manual is Revision D dated 28 Jan 1998. and the pilots
guide is part # 190-00067-60 Revision A.

Hope this helps, I will look further if you need more info than this, the
next time I drive up to Yucca, was short on time today.

Jim


On Wed, May 15, 2013 at 5:54 AM, Dennis King <kitfox94 at comcast.net> wrote:

> Thanks Jim...knowing it can work is half the battle for me.  When you get
> your documentation it would be helpful for me to know which pin/channel you
> connected to the autopilot.  I used "RS232 data out 2" (pin 19) because it
> was labeled as NMEA 0183 data in the Garmin installation manual.  There's
> an ARINC 429 channel available which I did not use because I don't have the
> GPSS option in my Pro Pilot.
>
> I will give Trio a call.  I am very happy with how the autopilot is
> working when connected to my portable GPS.  The factory default gains seem
> to work well on both axis on my plane (173 Elite RG).
>
> Dennis King
>
> ------------------------------
> *From: *"Jim & Sharon Beck" <jsbeck618 at gmail.com>
> *To: *"Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> *Sent: *Tuesday, May 14, 2013 10:45:18 PM
> *Subject: *Re: REFLECTOR: Garmin 250XL Autopilot Interface
>
>
> I have the 250 XL coupled to the Pro Pilot and it has worked flawlessly
> with no problems. My manuals are at the hangar snf don't remember exactly
> how I did it but just remember following the wiring diagram in the Garmin
> handbook.
> Try giving Trio a call, I found them most helpful, even on weekends, with
> any problems.  I will get my books this weekend and see if I can give any
> help
>
> Jim
> 173 Elite RG
> 450 + hours
>
>
> On Tue, May 14, 2013 at 12:02 PM, Dennis King <kitfox94 at comcast.net>wrote:
>
>> Does anybody have experience interfacing a Garmin 250 XL GPS/Com with an
>> autopilot?  I have one of the RS232 ports (channel 2) on the GPS connected
>> to a Trio Pro Pilot.  The autopilot receives the GPS info when the Garmin
>> unit is in test mode, but not in normal operating mode, even in flight with
>> or without an active course.  I have no problem interfacing a portable GPS
>> to the autopilot.  It sure seems like I must have a setting wrong in the
>> Garmin unit, but I've been through all the setup menus and tried all the
>> logical settings.  Since it works in test mode and with the engine running,
>> it doesn't seem to be a wiring or interference problem (I used shielded
>> cables).  Just hoping someone else has interfaced the 250 XL with any brand
>> autopilot and discovered a "trick".
>>
>> Dennis King
>>
>>
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>
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