[time-nuts] TU60-D120-041 power up

Mike Seguin n1jez at burlingtontelecom.net
Wed Oct 22 17:13:55 EDT 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...

Mike

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
> mode.
>
> 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
> sources.
>

-- 

73,
Mike, N1JEZ
"A closed mouth gathers no feet"



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