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Re: [gpsd-users] 1 PPS and Ubuntu11.10 serial port problem

From: Gary E. Miller
Subject: Re: [gpsd-users] 1 PPS and Ubuntu11.10 serial port problem
Date: Thu, 2 Feb 2012 00:24:01 -0800

Yo Robert!

On Wed, 01 Feb 2012 19:46:11 -0800
Robert Livingston <address@hidden> wrote:

> Thanks for the comments.  Swiping the testing version of 3.4.1 from 
> Debian testing (along with a couple of other packages) runs on Ubuntu 
> 11.10 and the "not-online" errors disappear.


> NTP works with the GPS as before, and as Hamish points out, that may
> be sufficient.  However, I'd like to use the 1 PPS in addition but
> the serial port never seems to see the CD pin signal.  In previous
> (older version) cases, the CD interrupt was noted in the -D5 list,
> and I see none now.  Have you seen cases where the UART is masking
> the interrupts, an is there a way to see if that is the case?

The most common problem is the PPS level is not real RS-232.  Are
you sure your output is going from -12V to 12V and back again?

Also some GPS need to be told to output PPS signals.

So best to put an oscilloscope on the pin if you can.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
        address@hidden  Tel:+1(541)382-8588

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