Connecting KIRRIO GPS (Mod.Nr. BR-306)
of Palm-GPS-Kit to a PC via a serial connection
===============================================================
USE AT YOUR OWN RISK !!!! NO GUARANTEE THAT IT WORKS WITH
YOUR EQUIPMENT !!!!
===============================================================
YOU CAN EASILY DAMAGE EITHER THE PC, PDA, GPS-Module or any
other component involved !!!!
Don't try it if you are not well trained in electronics
or computer technology.
===============================================================
CONSTRUCTION:
Male connector (PS/2 like) on PC side:
top view:
__-__
VDD/ \VSS
/ O O \
| |
| |
Tx| O # o |
(PC)| # |
| o O |
\ /Rx (PC)
\__^__/
Use a female 9-pin RS232 connector and an old mouse or keyboard
cable for the PS/2 connector (or buy a separate one and use some
cable with at least 4 lines...)
I used a cable from an old PS/2 Logitec mouse.
Take a useful supply connector (which easily match to standard
5V power supplies). For notebooks you can also use the USB supply,
for this purpose you need an USB connector.
I used a small connector which I fitted into the rs232 connector
casing. The connector matches to the original 5V palm cradle supply.
Connect Tx to pin 3 of the rs232 connector (I had a orange line).
Connect Rx to pin 2 of the rs232 connector (I had a yellow line).
Connect VDD to the inner connection (+) of the supply connector.
You may add a diode for supply protection (against wrong pol.) in the VDD line.
I used a 1N4148 for this purpose.
Connect VSS to the outer connection (-) of the supply connector.
===============================================================
TEST:
Connect the supply to the new cable.
Connect the cable to the serial port of a PC.
Before connecting the GPS module to the selfmade cable, check again
the voltages on the line.
VDD -> 5V against VSS (from the supply)
Tx -> -3V..-12V against PC ground (from the PC)
Rx -> approx. 0V (to the PC)
You should check if you see similar values when using the original cable
connected to your PDA and the supply. Otherwise your GPS module
is not compatible with mine and the whole thing may fail.
If you are lucky, you can check for a +5V and -5V pin, this are most
likely the supply and Tx line you could use instead (no guarantee!!!!).
I suppose that voltages less than -5V or higher +5V on the Tx line is
no problem for the GPS module (I don't think they add electronics in
their original RS-232 cables due to one reason: the costs!). At least
my notebook only delivers -/+5 V...
Now connect the module. After a second, the LED on the GPS module
must light red. Otherwise immediately break the connection and check
the cable again.
If it seems to be ok, start a terminal program with following setting:
4800 Baud, 8bit, no parity, 1 stopbit, no handshake
When resetting the module (disconnect/connect supply), you should see
the GPS module responding with some status lines (version, clocking,...),
then it starts sending time and positioning data...
Congratulations!!!!
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