David Lord wrote:
What sentences is it sending NMEA or binary?
How do you have the unit wired to the serial port?
The JST has pins 1-12 1=TxD2 2=RxD2 3=PPS 4=TxD1 5=TxD2
6=PD 7=AuxBat 8=GND 9/10=3.6 to 6V 11=nc 12=NMEA-out(cmos)
You need to check on below, it's best I can work out
ie JSTpin D9pin
3 --------- 1
4 --------- 2
5 --------- 3
8 ---+----- 5
|
+---- 0V
10 -------- +3.6 to +6V
CMOS generated RS232 levels should be ok but depends on
serial port of your pc. PPS out to DCD is given as 700mVp-p
into 50r so will need converting to rs232.
Tried to send a message to change to 9600, and turn PPS on.
Ignored messages because of improper syntax. Needs
proper checksum.
I have a gwbasic program for working out required messages.
GPSD will do it for you. Garmin site also have a windows
utility for generating required commands with checksum.
Does anyone know of software that actually works with this
unit?
GPSD?
Going back to your previous reply I can see NMEA driver
looks to be working ok and you just need to trim out
the offset. GPSD + SHM driver might work ok for this
without PPS to give you about 10ms offset or with PPS
any of GPSD + SHM, NMEA or NMEA + ATOM should get you
in low us range for offset.
David
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