[time-nuts] TU60-D120-041 power up
n1jez at burlingtontelecom.net
Wed Oct 22 21:13:55 UTC 2014
I wonder if these are similar to the TU30 series. On those, grounding
Pin 7 on J1 would bring the unit up @ 4800 baud NMEA...
On 10/22/2014 4:20 PM, Hal Murray wrote:
> sjdehaven at gmail.com said:
>> I think you pointed out that this GPS unit defaults to the Navman Binary
>> mode. I have tried to use HyperTerminal via a serial port and about all I
>> see is @@EA followed by a burst of random characters every second. I tried
>> 4800 and 9600 baud. I would like to be able to read the NMEA sentences
>> (GPGSA, etc) so I can use Day, Date, Time and 3D Fix for other purposes.
>> To do that I think I need to change the format of the GPS output data.
>> (From Navman Binary to ????)
> Things like @@Ea are probably Motorola/Oncore rather than Navman. I'm not
> familiar with Navman, but I found one web page on their site about the SiRF
> binary protocol.
> For things like this, my first try is usually gpsmon from the gpsd package.
> It's very good at figuring out what type of device you have.
> By default, "gpsmon /dev/ttyXXX" (for whatever the filename is on your setup)
> will try various baud rates and such until it recognizes something. Then it
> decodes and displays the data. By default it doesn't change the speed or
> There is a command to switch to/from NMEA and binary modes, and a command to
> change the baud rate.
> There is another command to try harder to discover the device type. That
> sends commands that might confuse/break some devices.
> Switching to NMEA mode may get lost when you reset or power cycle the device.
> It will probably stick around long enough for you to debug the next layer of
> software. You can probably find the command to switch-to-NMEA in the gpsd
"A closed mouth gathers no feet"
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