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nwaring Occasional Visitor
Joined: 07/08/2003 23:35:38 Posts: 2 Location: United Kingdom
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Posted: Sun Sep 14, 2003 8:04 am Post subject: Tomtom BT Receiver Protocols |
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Hi,
I have just received my new tomtom BT receiver (and very impressive it is too). I works fine with a quick fix etc.
I have read much about NMEA, SIRF WAAS etc. but am a bit lost as to what the receiver can do!
I know it works on NMEA protocol (using Leadtek GPS monitor on the laptop) but it doesn't seem to work if I select SIRF protocol... Is this something it should do?
I will be using it with TT Nav v2 and am also unsure as to:
... whether the TT software uses the SIRF protocol?
... or whether I souldn't really care as it all works,
... or whether it doesn't make a difference anyway,
... or whether it's only the communication between GPS unit & laptop/pda that uses the SIRF protocol??
... or is it the comms between the satelites & the GPS unit that uses SIRF
... and the manual says it has a SIRF chipset??
I guess it's all a little unclear so any advice welcome
Thanks
Nick
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Dave Frequent Visitor
Joined: Sep 10, 2003 Posts: 6460 Location: UK
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Posted: Sun Sep 14, 2003 8:04 am Post subject: Tomtom BT Receiver Protocols |
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The receiver will work in SiRF mode, although I haven't tried it, I believe it works on SiRF 4800 COM8. You won't notice a lot of difference with SiRF, apart from you will get position updates more frequently which can cause more of an issue when signal drops for a fraction of a second because it will keep beeping away saying it hasn't got a 3D fix. |
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nwaring Occasional Visitor
Joined: 07/08/2003 23:35:38 Posts: 2 Location: United Kingdom
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Dave Frequent Visitor
Joined: Sep 10, 2003 Posts: 6460 Location: UK
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Posted: Sun Sep 14, 2003 8:04 am Post subject: Tomtom BT Receiver Protocols |
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There were known problems with Emtacs and bluetooth switching from 4800 NMEA to another baudrate under SiRF would lock you out of the Bluetooth GPS, a fix for this was to switch from NMEA to SiRF on the same baud rate before changing to a different baud rate. AFAIK, I don't think it's a problem on the TomTom BT GPS. |
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