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

unruh unruh at invalid.ca
Wed Mar 7 16:58:05 UTC 2012


On 2012-03-07, Terje Mathisen <"terje.mathisen at tmsw.no"> wrote:
> Ron Frazier (NTP) wrote:
>> 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?
>
> No, my DCD observations seems to have been spurious, the gps will 
> respond to commands even if I ignore the protocol above.

Certainly when I tested the Sure I never followed any such protocol and
everything worked fine. 


>
> Terje
>
>



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