Ok I finally found the stupid thing, it was in a bag that had slid down between two boxes. I think it was hiding from me.
Ok here is the pinout I determined from looking at a few diagrams on the net. Looking at the gps unit fromthe front without a palm in place I numbered the connector from left to right 1 -10. These are the connections I deduced.
1 - DSR (DTR on Palm) Dataset Ready
2 - ??? (Vcc on Palm)
3 - TD (RD on Palm) Transmit Data
4 - CTS (RTS on Palm) Clear To Send
5 - RD (TD on Palm) Receive Data
6 - RTS (CTS on Palm) Ready To Send
7 - ??? (Initiate Hotsync on Palm)
8 - ??? (Used by Modem on Palm)
9 - NC (NC on Palm) No Connection
10 - GND (GND on Palm) Ground
I removed the Palm connector and cleaned out the holes leaving a nice place to solder wires to a DB9 connector to test. To create a "standard" (DTE I think) rs232 connection on the GPS I wired a DB9 male connector to it using the following conections.
GPS Pin > DB9 Pin (Meaning)
1 > 6 (DSR)
3 > 3 (TD)
4 > 8 (CTS)
5 > 2 (RD)
6 > 7 (RTS)
10 > 5 (GND)
I think it is DSR that turns the GPS on. I did confirm that it goes off after a delay or about 30 - 60 seconds when the port it is plugged into goes off.
The serial port on the GPS is full rs232 voltage levels as it has a maxNNN chip inside it to do voltage level conversion. I had this connected to my Casio E-125 PocketPC via the casio serial sync cable, a gender changer and an off the shelf null modem adaptor. It worked great with Teletype GPS on the Casio. The casio serial sync cable has the voltage convertor in the cable so I had to use it to be safe. Since the Ipaq pocketpc has a standard rs232 level serial port (I am pretty sure) it will be even easier to use with this usit. I just received my ipaq serial port cable today from Hong Kong so I may get to test it tonight.
PeteB
