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Leif
Sweden
141 Posts |
 Posted - 10 sept. 2008 : 20:44:27
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Quote from the help message box in the SirfTech NMEA, Set Serial Port (Switch to SiRF) dialog:
"Switching the SiRF chip to another baudrate is dangerous on some devices.
To get an indication of a safe baudrate, go to NMEA, Navigation Initialization, execute a Snap Start,
or power off/on, look for a baudrate in the scrollable grey window.
If SirfTech detects a protocol only when the comm port is opened with a specific baudrate it should be safe.
Bluetooth devices usually support only 38400. SD-501/502 are unsafe."
If a Comm, "Find Baud" doesn't help, you have very likely used an unsuitable baudrate. Then there is no way to communicate with the GPS chip to execute any command. You have to wait for the GPS to reset itself to default settings when it has been without power long enough. If the battery can be removed maybe after some seconds, minutes, hours or days if there is a capacitor holding charge, with non removable battery even weeks. Some have resorted to breaking up the receiver to short the battery for a second or two.
BR
Dennis
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Allycat
United Kingdom
59 Posts |
Posted - 11 sept. 2008 : 14:32:13
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Hi kavsko,
The Navman B10 seems to be very similar to the Holux236 and I believe 38400 baud is the ONLY safe "internal" rate (to command the SiRF chip) for the Bluetooth connection to work (the external "notional" baud rate can be different).
I also "killed" my B10 and had to remove the battery and wait ONE DAY before it worked again, so it probably has an internal button backup cell like the Holux.
But (unlike the Holux) I couldn't switch it to use the SiRF protocol, so maybe it's been disabled in this version of the firmware. However, I believe Static Navigation is ALREADY disabled, but this would prevent enabling SN or SBAS, or flashing new firmware, etc.
Are you sure that SN is enabled or is it the following problem? :
http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=82799
Cheers, Alan. |
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kavsko
Portugal
7 Posts |
Posted - 11 sept. 2008 : 21:06:02
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Hi.
Thanks Allycat and Leif for the responses.
To Leif:
- I'll try removing the battery for some time to see if it works.
To Allycat:
- I'm not sure if Static Nav is really on, I was trying to see.
- Sirftech didn't show the real state... like I said, I was trying to check it. But since I switched to Sirf mode I lost comunication with it. |
Kavsko |
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Allycat
United Kingdom
59 Posts |
Posted - 12 sept. 2008 : 14:10:42
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Hi kavsko,
An easy way to check SN is to watch the Lat/Long Position when moving slightly (a few metres) or even indoors. The last digits of the position will "wander" a little if SN is NOT enabled but (usually) will be constant with SN active.
A simple application (for Windows Mobiles) to switch SN is "MM-SirfSetup" but this reports "cannot communicate with GPS" with my B10. This again suggests that this particular GPS does not support SiRF protocol (other programs are reading the NMEA from it alright).
Cheers, Alan. |
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kavsko
Portugal
7 Posts |
Posted - 12 sept. 2008 : 18:33:20
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If my GPS receiver ever come back from the dead... I'll never try to mess with him again.
That's for sure...
But again, do you think that leaving him withou batteries a day ou 2 will be enough for it ti reset to factory defaults?
Is it supposed to do that?
Do they all do?
I hope I haven't killed him!  |
Kavsko |
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Allycat
United Kingdom
59 Posts |
Posted - 12 sept. 2008 : 19:46:36
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Hi kavsko,
Between 6 hours and 1 day was sufficient to reset my B10, so I would expect a few days at most to be enough for yours. I believe nearly all SiRF Bluetooth GPSs have NMEA as factory default, usually at 38400 baud, which occurs when ALL voltage is removed from the chip/RAM.
There are quicker methods to reset the device but most require opening the case or using a special cable, so for now it is best just to be patient.
Good luck, Alan. |
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kavsko
Portugal
7 Posts |
Posted - 15 sept. 2008 : 10:24:22
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Hello Alan.
Thanks for your support and technical explanations.
It's been 2 days since I let the battery drain.
I'll make the final test this night, hopefully it will be reset to factory defaults.
I'll let you know the result as soon as I test it.
Best regards,
Kavsko |
Kavsko |
Edited by - kavsko on 15 sept. 2008 10:25:33 |
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kavsko
Portugal
7 Posts |
Posted - 16 sept. 2008 : 11:11:42
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Hi Alan.
As I told before.
I tried may GPS Receiver today and its working just fine.
Thanks a lot for your support.
Best regards, |
Kavsko |
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StormyKnight
147 Posts |
Posted - 02 févr. 2009 : 13:38:30
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Hello, I have a question that hopefully may be answered here. I have a PNA (Mio Moov 300). What I want to do is using a script is to read the data coming from the GPS & toe xtract the date & Time & then set the time on the PNA.
Now I have all but 1 part working....If I run another GPS program first for a while, not neccessarly to the point of a position lock, I can then run my script & the date & time are valid. If I do not run any other GPS app after a hard reset, the GPS never gets a to the point where the date & Time become valid & never gets to a lock either. I run another GPS app & a lock is found within 30 seconds...
I'm monitoring the $GPRMC sentance.
Thanks |
Mio Moov 300 AU (Cobia_400_64_AU) Mio Pocket V3.0 R51 SD Install
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Leif
Sweden
141 Posts |
Posted - 05 févr. 2009 : 20:58:48
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| Inbuilt GPS chips are usually turned on by opening the com port and turned off by closing the port. Could it be that you open the com port, poll for one $GPRMC message and close the port? That would explain why it works when another program keeps the GPS chip running. |
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_hedgehog
24 Posts |
Posted - 12 mai 2009 : 09:05:18
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Hi Leif, I just registered to say thanks for Your sirftech program. This is really opening so many new oportunities for my Medion PNA ....
Still one question I have:
Is there a way to use Sirftech on commandline, say:
sirftech.exe protocol=nmea port=com2 baud=57600 GSA=1 StaticNavi=off
I know it is dangerous but it would really make the switching between different GPS a lot easier.
Thanks |
Edited by - _hedgehog on 12 mai 2009 15:50:27 |
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Leif
Sweden
141 Posts |
Posted - 12 mai 2009 : 22:05:20
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Thanks!
I did think of making separate programs for switching static navigation off and on using baudrates already succesfully used and recorded by SirfTech so would be safe. However I didn't have instant success at implementing and for some time I am low on motivation for working on these projects. Maybe next winter..
BR
Dennis |
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SirfTech Pocket PC, PC and Smartphone SiRF tweaker
