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[aprssig] APRS and Garmin Nuvi

Scott Miller scott at opentrac.org
Fri Feb 1 05:27:29 UTC 2008

I'm not at all sure that it's a generic solution.  I hope to find out 
from Garmin just how it works.  There's certainly not a host controller 
in the cable.

My guess is that the Nuvi detects some single-ended state on the USB 
data lines (like the USB reset state) and enters a serial mode.  It was 
certainly able to detect the fact that the cable was plugged in - it 
complained that external power was required when using a serial accessory.

I don't have much faith that the USB version of the GPS 18 would do the 
same, but I could be wrong.

It's certainly worth checking to see if someone already has an 
aftermarket cable out there.  Would probably need to go to the source to 
get a decent deal on it.  If I wind up building a tracker board that has 
the circuit built in, then it'd only need a $2 USB cable.


Chuck Gooden wrote:
> I seen cables on ebay that indicated they would convert the Garmin USB 
> to RS232. Search for "Garmin serial".   My guess is this is probably not 
> what your looking for but thought I'd mention it.   I was thinking of 
> possibly using one with a Garmin GPS18, since I didn't win the auction 
> for a RS232 version of the GPS18 on ebay.
>> -----Original Message-----
>> From: aprssig-bounces at lists.tapr.org
>> [mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Scott Miller
>> Sent: Thursday, January 31, 2008 11:01 PM
>> To: TAPR APRS Mailing List
>> Subject: [aprssig] APRS and Garmin Nuvi
>> When I heard about Garmin's fleet management interface, I decided it'd
>> be worth checking out.  It needs a special cable, though - for the Nuvi
>> 350 I picked up, it's Garmin p/n 010-10813-00.  By the looks of it, it's
>> probably just got a level converter inside, but I'm not sure.
>> Apparently there's a serial interface of some sort that can share the
>> USB connector.
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