[ntp:questions] Sure GPS: Programming it now works

unruh unruh at wormhole.physics.ubc.ca
Fri Apr 8 18:45:14 UTC 2011


On 2011-04-08, Terje Mathisen <"terje.mathisen at tmsw.no"> wrote:
> unruh wrote:
>> On 2011-04-07, Uwe Klein<uwe at klein-habertwedt.de>  wrote:
>>> unruh wrote:
>>>> Somewhat more awkward than Terje's program, but it works.
>>>>
>>> I've collected a bit of information
>>> 	http://wiederlinge.de/cgi-bin/lnwiki.cgi/147
>>> and wrote a basic parser script:
>>> 	http://wiederlinge.de/cgi-bin/lnwiki.cgi/150
>>>
>>> Terje added some info too.
>>>
>>> I will add the commands stuff to my script
>>> in ~10days. no time now.
>>>
>>> Feel free to add.
>>
>> Actually a more complete set of instructions that can be sent under the
>> MTK protocol is in
>> gpsd.googlecode.com/files/MTK_NMEA_Packet_0.71_Sanav.pdf
>
> Thanks!
>>
>> I of course have no idea which of these are actually valid for the
>> particular chipset that the Sure board uses.
>> This list includes the command  251($PMTK251) --change serial bitrate command,
>
> This is the one I got by reverse engineering (sniffing) the java 
> program, nice to see it documented.
>
>>   missing from the ETEK list. It also includes a rich set of Datum for the models used.
>> I do not know if the Sure can be changed from the WGS1984 Datum, in case
>> anyone might want to use, for example, number 147 -- Old Egyptian(1907)
>> datum instead.
>>
> I have tested and verified that at least my Sure board does not allow me 
> to ask for most of the 19 NMEA sentences listed in the 314 command: 
> Turning on all actually resulted in 5 or 6.

IK, I was going to try that as well, only one at a time. 

>
> I'll try again after first setting the board to 38400 baud. (Maybe it 
> only allows those sentences that actually fit inside the output window?)
>
> The 590 returns the flash information, I suspect that this means that 
> there is also a 390 to program it (including baud rate) and a 490 to 
> query the current flash status, giving the 590 info as a response.

Yes. Under the above docs
                                    
Packet Type: 390 PMTK_API_SET_USER_OPTION
Packet Type: 490 PMTK_API_GET_USER_OPTION

Note it can be set up to give various nmea sentences but only 5 of them,
not all 19



>
> Terje




More information about the questions mailing list