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

From: Gary E. Miller
Subject: Re: [gpsd-users] In which GR-601 does not equal GR-601W
Date: Wed, 27 Jul 2016 14:20:15 -0700

Yo Phil!

On Wed, 27 Jul 2016 16:27:54 -0400
Phil Stracchino <address@hidden> wrote:

> On 07/27/16 15:12, Gary E. Miller wrote:

> > I think there is a misunderstanding here.  The ONLY difference
> > between a GR-601 and a GR-601W is the addition of ONE patch wire.
> > Sadly the OEM vendor did not even change the model number on the
> > label.  
> I wasn't aware the manufacturer did not update the label.  I hope I
> haven't jumped to false conclusions.  The compatibility list leads me
> to believe that the 601W should identify as a native USB device,
> rather than only as a USB-serial interface.

The GR-601 and GR-601W both use the USB to serial converter. As do all
other USB GPS I have ever seen.  The only difference between the two
is that the PPS is connected to the Serial converter only on the W

> What does lsusb say about your GR-601W?  Mine reports this:
> Bus 005 Device 005: ID 067b:2303 Prolific Technology, Inc. PL2303
> Serial Port

Looks perfect.

> > Then verified that you have a 3D fix, and PPS is shown in the lower
> > window?  
> 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.

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

> Right now, ntpd -q is reporting the following:

Forget ntpd for now.  gpsmon does not output anything to ntpd.

Step by step, do nnot skip steps!

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

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