Re: GPS problem
From: AlanS (news_at_remove.abyz.fslife.co.uk)
Date: 09/05/04
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Date: Sun, 5 Sep 2004 06:27:03 +0100
"David Hettel MS MVP - Mobile Devices" <dhettel@fuse.net> wrote in message
news:%23Ezr2NpkEHA.1348@TK2MSFTNGP15.phx.gbl...
> Perhaps I am missing something here. The Garmin cable to the PC is a
simple
> cable, no electronics in it. It should show continuity on each line/pin.
There are only 4 pins on the Garmin unit. Therefore a MAXIMUM of 4 need to
be connected- more means more cost.
1 pin is for external power- it is specificaly not supported in the cable I
bought, and there is NO connector in the cable. That leaves the 3 connectors
I mentioned in an earlier post- a ground, data in, and data out.
The cable that then interfaces to my ppc connects to this cable, so only 3
pins are relevant, of which I can only detect continuity, or a connection,
to 1 of these pins.
> From what others have posted the ASUS A620 has a ttl to RS232 converter in
> it. I would not expect it to show continuity between pins. (And I would
not
> be surprised if you happen to check between pins on the same connector
(eg.
> between pins on the RS232 connector) that you have blown the converter
> within the ASUS A620 cable. The convert is protected when power up, but
> applying power to pins on it when it is not power up is a very bad thing
to
> do, generally.
>
The connection being tested is cable only. The A620 could be in China,
Australia or anywhere else- it's not relevant to the cable continuity test.
> Here in the States I would need both a null modem adapter and also a
gender
> changer. Most PocketPCs have two versions of a serial cable. One designed
> for ActiveSyncing which would require both the gender changer and null
modem
> adapter from Radio Shack. The other type, would be to add a serial
> peripheral to the PocketPC (Which is harder to come by, and in my
experience
> generally short say 6 inches or so) and will have the same 9 pin connector
> as on your PC.
>
The cable doesn't need a gender changer, but connection to my Psion
organiser did. (But that used a Psion serial connector which did data
transfers not only GPS data). The cable from PC-Mobile is specifically GPS
only. It needs no more than the 3 pin connections to fulfil its purpose.
wrt the null modem I have tried both ways- with and without- as the need for
one is not specifically stated on the pc-mobile site. It is a passive device
so no damage can be done, all that happens is data out and data in get
swapped around.
>
>
> --
> David Hettel
> Microsoft MVP Mobile Devices
>
> This posting is provided "as is" with no warranties, and confers no
rights.
> You assume all risks for your use.
>
> Handhelds, mobile: http://www.geekzone.co.nz
> Bluetooth guides: http://www.geekzone.co.nz/content.asp?contentid=449
>
> "AlanS" <news@remove.abyz.fslife.co.uk> wrote in message
> news:chcdhm$8dk$1@newsg2.svr.pol.co.uk...
> >
> > "Darren Griffin - PocketGPS" <darren@pocketgpsworld.com> wrote in
message
> > news:OKmjWgkkEHA.3848@tk2msftngp13.phx.gbl...
> >> AlanS wrote:
> >> > Thanks. I'd ordered via ukorder2@pc-mobile.net and had emailed them,
> >> > but no response in over 24 hours, and it's now the weekend. I'll try
> >> > a copy to the address you give too.
> >>
> >> Or post in our PC-Mobile Forum which is moderated by them
> >>
> >
<http://www.pocketgpsworld.com/modules.php?name=Forums&file=viewforum&f=49>
> >> They have an excellent reputation for service so have no fear that they
> > will
> >> replace the cable.
> >> --
> >> Darren Griffin
> >> PocketGPSWorld - www.pocketgpsworld.com
> >> The Premier GPS Resource for News, Reviews and Forums
> >>
> >>
> >
> > Thanks.
> >
> > That would be 3 messages agent about this them in under 2 days, and at
the
> > weekend too, plus this newsgroup would make 4! (1 to them in HK, 1 to
the
> > UK
> > already sent).
> >
> > I don't really want to give the wrong impression (that I'm swamping them
> > with emails/postings all over the place!) so I'll hang on a few more
days
> > before trying there, but thanks for the link. I'm really like to confirm
> > if
> > it is actually faulty first, then how to get a working replacement
> > (preferably checked by them- someone/anyone - for operation first).
> >
> > I would like to double check the pin continuity though- to know if the 3
> > Garmin data pins do show continuity on a working cable in this way (and
> > which pins connect to which if possible- but just the continuity would
> > confirm the status of my cable).
> >
> > Many thanks for the link.
> >
> >
> > As an aside I'd like to recommend the battery box that they sell. It
seems
> > smaller than I had expected, and is pretty neat and well built. There is
a
> > screwhole to hold the top cover in place but no screw provided! It seems
> > solid enough without a screw in place, and it looks like a fairly small
> > self
> > tapper would be needed. If the screw was in place I'd need the
screwdriver
> > with me on travels to allow battery changes so it's probably best not
> > used-
> > it doesn't seem to work well enough without the screw.
> > When connected and switched on it charges the internal battery (as if
the
> > pda is connected to the mains), and one set of 4 x 1500 mAH NiMH
batteries
> > have given 2 charges from around 60% up to now. NiMH AA batteries can be
> > found with over 2000 mAH now- I've seen 2150 mAH ones.
> > It seems as if it will be a good convenient alternative to a travel
> > charger-
> > smaller and lighter too.
> > The cable seems quite short- but actually is about 12 inches long. A
nice
> > and inexpensive accessory I certainly recommend, certainly not just for
> > GPS
> > users but offers an easy, portable and inexpensive way to extend the
pda's
> > battery life.
> >
> >
> >
>
>
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