[time-nuts] GPSDO standard interface?

"Björn Gabrielsson" bg at lysator.liu.se
Fri Jun 27 01:39:17 EDT 2014


Novatel has two versions of each message one binary (ending with B) and
one ASCII (ending with A). That is one way of catering to both the
interactive use and the clean software side of the problem.

Javad (GRIL now GREIS) is my personal favorite. Your commands are ascii,
often very short. The output messages are usually binary but with a prefix
and ending linefeed that makes it easy to monitor which messages are
active in a plain console terminal. The binary parts are also constructed
in such a way that makes it very easy to receive them in normal structs.

my two öre.

/Björn

> I dislike TSIP quite a bit. It's a disaster in my opinion if you are not
> intimately familiar already with the Trimble binary commands, and  exists
> in
> a number of inconsistent and non-compatible dialects as far as I know.  No
> way for a human to enter a simple command in a simple text terminal, you
> have to have everything translated by some application. I know the
> software
> folks like binary better than ASCII, because parsing binary  commands can
> theoretically be done with less effort. I think effort ==  results.
>
> There is SatStat, GPSCon, and Ulrich's great Z38xx control program for
> human readable SCPI commands besides the good old ASCII terminals. HP
> leads the
>  way with GPIB/SCPI in my opinion. But it's like religion, everyone thinks
> theirs  is the right one, and everyone else is on the wrong path.
>
> bye,
> Said
>
>
> In a message dated 6/26/2014 14:01:35 Pacific Daylight Time,
> holrum at hotmail.com writes:
>
> There  are TSIP commands for doing all those things.  It should be fairly
> easy  to adapt them to control your hardware and whatever GPS receiver you
> are  using.
> The nice thing about implementing a TSIP interface is being able to  use
> existing programs like Tboltmon and Lady Heather (over 30,000 lines of
> code)
> to monitor and control it.  Also NTP knows how to talk  TSIP.
>
>
>
> ----------------
> I am planning on the output of at  least position, corrected phase error,
> DAC value, ambient temperature, and a  few other things.  I also see a
> need
> to read and write the PID gain and  damping factors, but that may just
> have
> to be a custom tty interface.  It  may be that I need to have a
> pass-through
> mode to give direct access to the  receiver for triggering site survey,
> etc.
>
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