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Re: [gpsd-users] Garmin GPS-19X HVS
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From: |
Gary E. Miller |
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Subject: |
Re: [gpsd-users] Garmin GPS-19X HVS |
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Date: |
Mon, 6 Apr 2015 13:38:00 -0700 |
Yo John!
On Mon, 6 Apr 2015 16:09:24 -0400
"Burton, John" <address@hidden> wrote:
> A project I am working on is considering using a Garmin GPS-19X HVS
> receiver. I did not see this particular model in the GPSD list of
> compatible devices. I am wondering if anyone has any knowledge /
> experience with this particular devices.
None so far, maybe some lurker will chime in.
Luckily I just read that doc yesterday.
> I also need to use this
> device to synchronize the system clock to GPS time. Specifically:
>
> - How compatible is this device with GPSD in general
The Garmin binary protocol is aweful. The serial variants also speak
a fair version of NMEA.
Fair warning, the GPS-18 has pretty bad sensitivity by modern standards,
be sure the 19 is sensitive enough for you.
The $200 prive of the -19 HVS would be a deal killer for me.
> - How well does this work with the kernel PPS under Linux?
Probably OK, with the caveats above and below.
> It has an RS-232 interface and a separate PPS line out with voltage levels
> compatible with the RS-232, so its possible to get a PPS signal on
> the DCD line of the RS-232.
Looking at the doc:
http://static.garmincdn.com/pumac/GPS_19x_HVS_Tech_Specs_EN.pdf
I see PPS on the violet wire. But the output voltage levels are
clearly not RS-232:
Section 2:
The unit accepts TIA-232-F (RS-232) level inputs and transmits
voltage levels from ground 3.3 V[sic}
Some serial ports can handel 3.3V inputs, some not. So clearly NOT
RS-232 compatible in all cases.
> Can anyone provide some feedback on this device?
If you buy it let us know how it works for you, but you can do a lot
cheaper and probably a lot better.
For usually under $40 you can buy GPS mice with PPS, like this one for $35:
http://www.amazon.com/GPS-Receiver-Interface-Cable-Length/dp/B00NOOIM9U/ref=sr_1_5?ie=UTF8&qid=1428352523&sr=8-5&keywords=pps+gps
The DIN connector is standard, so you only need to make an adapter cable.
Similar issues with the voltage levels.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
address@hidden Tel:+1(541)382-8588