Palm IIIxe & Garmin Etrex

Frosty · Occasional Visitor Joined: Jan 19, 2004 Posts: 13

hi,
ive got a palm III and a garmin etrex (guess you figured that already) and tomtom citymaps... my pda is not communicating with the etrex... ive got a gender changer on the cables to join them... now i know for certain that the gender changer is doing it's job.. ive tried all the comms types that the gps can do... but the pda cant see the gps...

anybody got any ideas?

lbendlin · Posted: Mon Jan 19, 2004 3:41 pm Post subject:

The gender changer is normally inverting/mirroring the wires. That may not be what you want... Just because it fits physically doesn't mean the right wires will be connected... Are you familiar with RxD and TxD ?
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Frosty · Occasional Visitor Joined: Jan 19, 2004 Posts: 13

name a place where i can get a non inverting gender changer..

DavidW · Posted: Mon Jan 19, 2004 11:56 pm Post subject:

I'm not that familiar with the Palm - but on the Pocket PC, most serial cables are designed to be connected to a serial port on the PC to synchronise the PDA.

I suspect the same may be the case for your Palm - in which case the adapter you need should be a null modem, not just a gender changer.

David

Frosty · Occasional Visitor Joined: Jan 19, 2004 Posts: 13

ok.. well heres a fun thing i also have a toshiba e310... ya dont happen to know anywhere i can ger a serial cable for it or any way i can driv ea usb-> serial adapter with it?

jsiegel · Posted: Sat Jan 24, 2004 9:25 pm Post subject:

As a developer of GPS software for Palm OS, I run into this situation often. It is easily solved. You are halfway there with your gender changer - you just need one more little part - a null modem.

Radio Shack sells a nice little null modem - it's very inexpensive. Plug the null modem into the gender changer and put all of that onto the end of the Palm cable. That should then attach to your GPS.

The problem is that the receive and transmit lines need to be crossed since both the Palm and GPS are expecting to be connected to a "master" type of device like a PC.

Frosty · Occasional Visitor Joined: Jan 19, 2004 Posts: 13

got a wiring diagram?

jsiegel · Posted: Sun Jan 25, 2004 5:05 pm Post subject:

The wiring diagram would tie ground to ground and cross transmit and receive. That's all a null modem does...

Frosty · Occasional Visitor Joined: Jan 19, 2004 Posts: 13

cheers ;)

Frosty · Occasional Visitor Joined: Jan 19, 2004 Posts: 13

right... cable made and works Smile

cheers to all that helped Smile

MemoPad · Occasional Visitor Joined: Feb 03, 2004 Posts: 1

Hi Frosty,

Did you mean you can make your Toshiba e310 work with a GPS or just the Palm?

I got an offer of an e310 at a very good price. If if can be hooked up to a GPS via a serial cables, I will take it.

Thanks

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