Connecting Magellan to IPAQ using serial cable

Nuutti · Occasional Visitor Joined: Jan 17, 2005 Posts: 4

I try to explain my problem with my imperfect english skills..

I'm trying to connect my Magellan Meridian to iPAQ h2110 using serial cable.

I have a cable for Magellan that converts its own port to "female" serial port.

Accordingly I have a cable for PDA that converts its own port to "female" serial port.

I used a gerder changer adapter that has spike connectors on both sides to connect these two female ports. But my PDA isn't receiving any information from GPS.

The adapter looks like this:

The other side:

\ooooo/
-\oooo/

And the other:

-/oooo\
/ooooo\

I don't have a voltage meter to verify it, but I guess upper row pins are connected to lower row pins on the other side. If so pin 1 should be connected to pin 1 etc.. Any ideas what could be wrong at my setup? All the cables work when used separately and GPS works fine with laptop.

lbendlin · Posted: Mon Jan 17, 2005 10:49 pm Post subject:

You need a null modem gender changer (where all the lines are crossed)
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Nuutti · Occasional Visitor Joined: Jan 17, 2005 Posts: 4

I still can't get it working..

Before solding an adapter, I tried connecting ports with pieces of wires.
Now PDA recognizes at least some signal, but it says "No NMEA type signal".

GPS manual says:
PIN2: transmit
PIN3: receive
PIN5: ground

In the picture connections are surely wrong, but i tried with no luck connecting
GPS pin2 to PDA pin3 and
GPS pin3 to PDA pin2
as some picture on the net suggested.

lbendlin · Posted: Tue Jan 18, 2005 10:37 pm Post subject:

Have you set the Magellan to output NMEA protocol?

You can verify that by connecting the Magellan to a Notebook and looking at the data in a terminal program.
The wires (2,3,GND) should be ok.
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Nuutti · Occasional Visitor Joined: Jan 17, 2005 Posts: 4

Yes it is outputting NMEA, and it works fine with same programs PC version.

Is the GND wire necessary to attach, if I try different connections with transmit & receive wires?

lbendlin · Posted: Tue Jan 18, 2005 11:23 pm Post subject:

Yes, GND is absolutely required.

How about the Baud rate? Have you set it to the same value as on the PC?
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Nuutti · Occasional Visitor Joined: Jan 17, 2005 Posts: 4

Baud rates match, but i quess GND was the reason. I was too lazy to attach it when I tried different connections. Rolling Eyes

I quess the right setup is:
GPS pin2 -> PDA pin3
GPS pin3 -> PDA pin2
GND from GPS pin5 to PDA pin5 (across)

I'll try tomorrow if it works. Thanks for the help!

Pc-Mobile · Posted: Wed Jan 19, 2005 2:58 am Post subject:

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