Re: Trimble Acutime 2000 with GPSD

[Gary E. Miller]

Yo ZB!

> I think I need some help.

We all need help.  :-)

> I have a Trimble Acutime 2000 GPS
> Antenna/receiver. I have it connected to the RS422 port on my
> computer, which is "/dev/ttyS4".

Cam you see data on ttyS4 before you start gpsd?  Like with "cat", or
"minicom".


> My GPSD version is 3.24, compiled
> from source.

Good.

> Running on Linux Mint 21, 64bit.

OK.

> I have pps-tool also installed.

OK.

> Is there anything special I need to do to have GPSD
> interpret the TSIP packet and/or PPS coming in from this Acutime 2000
> ?

Nope.  Just fire up gpsd as root: gpsd -n /dev/ttyS4


> When I try to fetch the PPS messages via "sudo ppstest /dev/pps0"
> (or /dev/pps1...or /dev/ttyS4).

Not your problem now, but:

    https://gpsd.io/ubxtool-examples.html#_sudo_sudont

> it says "PPS timed out".

The first check your connections.  I'm not aware os any RS-422 hardware
for Linux.  What are you using?

Before you start gpsd, run ppscheck naked, as root (not with sudo):

        ppscheck /dev/ttyS4


>  Attached is
> the output for about 10 seconds from the commands "sudo gpsd -n -N -D
> 5 /dev/ttyS4"

10 seconds?  Autobaud can take WAY longer than 10 seconds.  Did you set
the serial port speed first?

That said, looks like gpsd is reading your TSIP just fine.


> and "cgps".


You see satellites, so gpsd is talking to the receiver just fine.

> Also, the CGPS command doesn't update every
> second...it only updates every 2 seconds or so

Not abnormal.  It depends on the default configuration of your
receiver.

> and it doesn't show
> Lat/Lon, etc....

Well, you cgps says you no fix, but you do see satellties and their
SNR is good.  Did you wait 30 minutes for the almanac to download?  Then
waited for the survey to complete?

I assume your antenna is outside, with a good sky view, and no multipth
or GPS repeaters?

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin

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