At 18:03 19 January 2011, Andy wrote:
On Jan 19, 10:20=A0am, Rob Shepherd wrote:
Evening all,

I'm trying to use a Garmin GPS III to provide the positioning signal
for
my Cleverbox vario. I've set up the output as NMEA at a baud rate of
4800, no matter what I try, the vario still can't see the signal.

I've tried a master reset on the Garmin and my PC can see the unit,
upload/download waypoints but still no luck.

I spoke to Cleverbox who confirmed the cabling and plugs are correct
but
still no joy.

Any ideas?

Cheers
Rob

Since you say you have setup the Garmin output I assume that what you
have set is what the Cleverbox requires. It seems the next step would
be to verify that the box will receive an input from another GPS and/
or to verify that your GPS will drive another sink. You could perhaps
use a PC serial port and a terminal emulator to do this.

Checking the Garmin TX pin with a 'scope would tell you if it is
transmitting anything at all.

I assume you have checked the obvious - Garmin TX connected to box
RX, and not TX to TX and RX to RX. The interface should only need 2
wires - TX to RX and GND to GND.

Andy


Used the TX from the Garmin to pin no.8 on the RS232 on the Cleverbox side
which is GPS input, according to the instructions. Still no joy. GPS set to
NMEA out 4800 baud rate.

Cheers
Rob