Re: [Gpsbabel-misc] Usb -> com port issue

[Robert L. <rob...@us...>]

Mark England wrote:

> I am using GSAK to manage my waypoints and I am trying to upload my
> waypoints direct to my Garmin Vista.  The problem I am having is this.

Thanx for the good description.  I've seen this before, so there really
is some kind of a problem, but so far we've been unable to figure out
where.

See also:

http://sourceforge.net/mailarchive/forum.php?thread_id=3D4543821&forum_id=
=3D12066

> I can upload my waypoints from oziexplorer with no prolems at all via
> the usb -> com port device going through com port 4

I keep seeing USB serial mentioned in a some really weird problems.
I can't really tell if it's a key variable or not.  I deduce you're
running some kind of windows, right?

> Rx Data:10 ff 83 a9 00 68 01 65 54 72 65 78 20 56 69 73 74 61 20 53 6f
> 66 74 77 61 72 65 20 56 65 72 73 69 6f 6e 20 33 2e 36 30 00 56 45 52 42
> 4d 41 50 20 50 61 63 69 66 69 63 20 48 69 67 68 77 61 79 20 31 2e 30 30
> 00 56 45 52 53 4d 41 50 20 42 72 6f 6b 65 6e 20 48 69 6c 6c 2c 20 4e 53
> 57 2c 20 54 61 6d 77 6f 72 74 68 2c 20 4e 53 57 2c 20 50 6f 72 74 20 4d
> 61 63 71 75 61 72 69 65 2c 20 4e 20 30 2e 30 30 00 a6 10 03=20
> Tx Data:10 06 02 ff 00 f9 10 03 : .....eTrex Vista Software Version 3.60
> ID:		169
>=20
> Version:	3.60
>=20
> GPSBabel Version: 1.2.3

So far so good.  We asked for the version and we got it and we told the
unit we got it.


> GPS_Packet_Read: No DLE
>=20
> Rx Data:00=20
> Tx Data:10 06 02 ff 00 f9 10 03 : .....Capability 'C'.  Type 26624
> Capability '=01'.  Type 21605
> Capability 'r'.  Type 30821

This is the beginning of our trip involving a handbasket.  We got a
packet that started with a '0' instead of a Data Link Escape.  This
is absolutely not supposed to happen according to Garmin's protocol
spec.  (I've already said, though, that I file that spec under "Fiction"
and "Fantasy". :-) We then burst into flames because we take the (now
mangled) previous packet an interpret it as something we shouldn't.

The questions to be answered here are:

A) Is this an intermittent thing or is this consistent for you?
B) Do others with a Vista see this problem?
 B1) Do they have the same firmware?
C) Is the USB converter thingy a "real" component of this problem, or is
   it a red herring?   (Can you try on a legacy serial port or a different
   flavour of USB converter?)
D) Is the receiver really sending a zero there?   (I have line analyzers
   to help answer that kind of question.)
E) Is the unit possibly just too slow to respond and we're incurring
   a receive timeout?    (I can send you an instrumented version that=20
   runs the timeouts up and/or issues a diagnostic when this happens.)

If you really are in Australia, I'm guessing that sending me the
affected combo is impractical.  Are you perhaps near the other England
(Clyde) in .au and able to trade pieces and parts with him?

I'd really like to get to the bottom of this as it's currently a ghost
rattling chains in my attic...

RJL