Re: [gpsd-users] In which GR-601 does not equal GR-601W

[Phil Stracchino]

On 07/27/16 17:20, Gary E. Miller wrote:
> On Wed, 27 Jul 2016 16:27:54 -0400
> Phil Stracchino <address@hidden> wrote:
>> Oh, I get a great solid 3D fix, typically from 8 satellites but
>> sometimes as low as 6 or as high as 10, but I'm getting no PPS signal
>> that I can see and recognize.  gpsmon reports the following stanzas:
>>
>>
>> (76)
>> $GPGGA,200248.00,4333.62576,N,07121.30481,W,1,08,1.03,313.3,M,-32.4,M,,*6E\x0d\x0a
>> (58) $GPGSA,A,3,06,12,17,02,28,19,03,24,,,,,1.67,1.03,1.32*06\x0d\x0a
>> (68)
>> $GPGSV,4,1,13,02,33,256,28,03,27,047,28,06,73,283,38,09,09,115,*7D\x0d\x0a
>> (68)
>> $GPGSV,4,2,13,12,26,316,30,17,62,092,36,19,79,022,19,22,07,039,*72\x0d\x0a
>> (66)
>> $GPGSV,4,3,13,23,12,089,,24,08,270,24,28,20,167,28,46,32,215,*75\x0d\x0a
>> (31) $GPGSV,4,4,13,51,28,226,27*46\x0d\x0a
>> (52) $GPGLL,4333.62576,N,07121.30481,W,200248.00,A,A*7B\x0d\x0a
>> (68)
>> $GPRMC,200249.00,A,4333.62578,N,07121.30487,W,0.086,,270716,,,A*60\x0d\x0a
>> (35) $GPVTG,,T,,M,0.086,N,0.159,K,A*20\x0d\x0a
> 
> you should have a line that looks like this:
> 
> ---------------------------- PPS offset 0.0011234 ------
>
> You may need to wait a minute or two to get it.

Nope.  Nothing like that, after gpsmon has been running over 30 minutes.


> Another test, go into your gpsd source tree, then into the
> contrib directory.  Compile and run the ppscheck program.
> 
> The output should look like this:
> 
> contrib # gcc ppscheck.c -o ppscheck
> contrib # ./ppscheck /dev/ttyUSB1
> 1469654345  868735381
> 1469654345  869742911 TIOCM_CD
> 1469654346     787411
> 1469654346  100749867 TIOCM_CD
> 1469654347     774397
> 1469654347  100766398 TIOCM_CD


minbar:root:/var/tmp/portage/sci-geosciences/gpsd-3.16/work/gpsd-3.16/contrib:30
# ppscheck /dev/ttyUSB0
1469654953  178328606
1469654953  180314316 TIOCM_CD
1469654954    8334315
1469654954  108345128 TIOCM_CD
1469654955    8369058
1469654955  108379130 TIOCM_CD
1469654956    8405679
1469654956  108413694 TIOCM_CD
1469654957    8436334
1469654957  108446260 TIOCM_CD
1469654958    8470705
1469654958  108483992 TIOCM_CD

So ppscheck is reporting something there.  I confess to not knowing how
to read what it's trying to tell me, aside from the obvious
seconds-since-the-epoch in column 1.  What are the other two columns?


-- 
  Phil Stracchino
  Babylon Communications
  address@hidden
  address@hidden
  Landline: 603.293.8485

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