[ntp:questions] got the Sure GPS on order, how do I program it

Ron Frazier (NTP) timekeepingntplist at c3energy.com
Tue Mar 13 04:29:43 UTC 2012

Hi Charles,

Thanks for the info.  I found some data about programming this thing in 
old threads on this list from 2011.  I also found a program by Terje 
which can send commands to it.  However, I'm saving your message too in 
case I get desperate for more info.



On 3/12/2012 2:08 PM, Charles Elliott wrote:
> I found many copies of the "MTK NMEA Packet User Manual" by doing a Google
> search on $PMTK[NNN].  Some are far more complete that others, and the GPS
> chip in the SURE board may not implement all the instructions given in a
> particular manual.
> Purchasing a new soldering iron with a small tip is a great idea.  Make sure
> you cool the solder joint as soon as possible with your wet finger.  Using
> small diameter wire as indicated on www.satsignal.eu/ntp/Sure-GPS.htm is
> also a good idea.
> Good luck!
> Charles Elliott
>> -----Original Message-----
>> From: questions-bounces+elliott.ch=verizon.net at lists.ntp.org
>> [mailto:questions-bounces+elliott.ch=verizon.net at lists.ntp.org] On
>> Behalf Of Ron Frazier (NTP)
>> Sent: Tuesday, March 06, 2012 10:34 PM
>> Cc: questions at lists.ntp.org
>> Subject: Re: [ntp:questions] got the Sure GPS on order, how do I
>> program it
>> On 3/6/2012 6:15 AM, Terje Mathisen wrote:
>>> Ron Frazier (NTP) wrote:
>>>> Hi all,
>>>> OK, I went and ordered the Sure GPS board, cables, box, hardware,
>>>> etc. I even bought a cheapie soldering station for $ 20. Other than
>>>> the mechanical setup which I can figure out and the patches which
>>>> David Taylor has documented, I need to know how to program the unit
>>>> when it comes.
>>>> Specifically, can someone tell me how to:
>>>> * change the baud rate
>>>> * change which sentences are output
>>>> * change the update interval
>>>> * enable waas, if that matters for timing
>>>> * set fixed location mode, if available
>>>> * restore nav mode
>>>> * do a warm restart
>>>> * do a cold restart
>>>> * do a reset to factory defaults
>>>> * save the settings to flash or backup memory so I don't lose them
>>>> when it's powered off
>>>> * if possible, output only the GPZDA sentence
>>>> * Any other magic you think I should know.
>>> I wrote a program to do exactly what you want, I think I posted a
>> link
>>> to the source code and (windows) executable.
>>> If you can't find it, email me.
>>> Terje
>> Hi Terje,
>> (Anyone can answer.)
>> I found this old message from April by you.  Here's part of it.
>> quote on ->
>> I.e. the proper programming setup seems to be:
>> 1: Listen to incoming chars.
>> 2: After a CRLF sequence, start a timer: If a new char arrives within
>> less than 40 ms, goto 1.
>> 3: Send '0', start timer waiting for CD to drop.
>> 4: If CD drops before any new chars arrive, we are ready to send our
>> command, so send it out before the 100 ms gps timeout.
>> <- quote off
>> So, here's my question.  Based on your comments, the Sure board is
>> using, and driving the CD line for it's own purposes.  So, if we're
>> soldering a wire to the CD line on the RS-232 connector, aren't we
>> going to be in conflict with the boards own functions?
>> Sincerely,
>> Ron


(PS - If you email me and don't get a quick response, don't be concerned.
I get about 300 emails per day from alternate energy mailing lists and
such.  I don't always see new messages very quickly.  If you need a
reply and have not heard from me in 1 - 2 weeks, send your message again.)

Ron Frazier
timekeepingdude AT c3energy.com

More information about the questions mailing list