Quoth Hal Murray at 2008-04-02 14:08... >> My manual suggests you need to send >> @@Ci<mode><cksum><CR><LF> > > I had a similar problem a while ago. > > I wrote a simple python hack to compute the checksum. The manual probably > has an example you can test it on. ... > It's also worth checking gpsd. It knows how to talk to lots and lots of GPS > units and can smash some of them into a useful state.
Thanks for the suggestions. I'll play around in Perl to get something going and then translate it to C for use as a start-up routine. (I was going to put on of the GT+s in a Nixie clock, so Perl is out of the question there ;-)) The GT+s are definitely behaving strangely; I just connected the one that finally decided to talk to me to the computer that will be the time server and fired up gpsd: # gpsd -D 4 -n -N /dev/cua00 gpsd: launching (Version 2.34) gpsd: listening on port 2947 gpsd: running with effective group ID 0 gpsd: running with effective user ID 0 gpsd: opening GPS data source at '/dev/cua00' gpsd: speed 9600, 8N1 gpsd: garmin_gps not active. gpsd: no probe matched... gpsd: gpsd_activate(1): opened GPS (6) Didn't recognise it, just sat there. (The documentation mentions specifically that it knows about GT+s.) I re-connected the module to the machine with VisualGPS, now I can't get it to talk to me again. This doesn't seem right - either the thing should work or not. I do have my suspicions about those on-board batteries and wonder if I would be better off without them. Think I'll use the VP for the time server and leave the GT+s for further experimentation unless anyone just happens to know why they aren't playing along. Cheers M -- Matthew Smith Smiffytech - Technology Consulting & Web Application Development Business: http://www.smiffytech.com/ Personal: http://www.smiffysplace.com/ LinkedIn: http://www.linkedin.com/in/smiffy _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
