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faramoggy Occasional Visitor
Joined: Jun 19, 2004 Posts: 17
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Posted: Wed Oct 12, 2005 4:40 pm Post subject: BT338 TomTom5 Hx4700 problem |
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I have a hx4700 with a BT338 GPS. This all works fine with TomeTom Navigator 3.
Installing TomTom 5 on and I get no GPS signal. There is connectivity between the BT338 and the 4700 though !.
I borrowed a friends Bluetooth GPS reciever and theat works fine (although connection seems to be SPP not COM (??). Either way - clearly the s/w works on the pda, the BT338 works also (TT3)
Any idea why a cheapo BT GPS works whilst a near top of the line one does not with TT5
Help appreciated |
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lbendlin Pocket GPS Staff
Joined: 02/11/2002 22:41:59 Posts: 11878 Location: Massachusetts, USA
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Posted: Wed Oct 12, 2005 10:07 pm Post subject: |
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This is because TomTom 5 doesn't understand SiRF protocol any more (TTN3 did). Switch your receiver to NMEA and all will be well. _________________ Lutz
Report Map Errors here:
TomTom/TeleAtlas NAVTEQ |
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faramoggy Occasional Visitor
Joined: Jun 19, 2004 Posts: 17
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Posted: Wed Oct 12, 2005 10:54 pm Post subject: |
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thanks for the reply - but I already tried setting TT5 to NMEA with no avail. In fact I tried all the combinations without success.
SInce my posting I borrowed a friends unbranded GPS receiver. It worked fine - no problems. What is really bothering me is that several people on this forum clearly have TT5 Hx4700 & BT338 and are happy - what is different ?
Do I need to upgrade the ROM (something I have been reluctant to do) or what ?
Answers please !!! |
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lbendlin Pocket GPS Staff
Joined: 02/11/2002 22:41:59 Posts: 11878 Location: Massachusetts, USA
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Posted: Wed Oct 12, 2005 11:50 pm Post subject: |
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faramoggy wrote: | but I already tried setting TT5 to NMEA with no avail. |
how about actually reading my answer? You need to set the receiver to NMEA, not TTN5. _________________ Lutz
Report Map Errors here:
TomTom/TeleAtlas NAVTEQ |
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faramoggy Occasional Visitor
Joined: Jun 19, 2004 Posts: 17
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Posted: Thu Oct 13, 2005 8:36 am Post subject: |
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OK, flipant your answer may be, but actually it makes a whole load of sense: a firends reciever (which is nmea only) works fine, and TT3 pretty well does sirf. mmmmhhh why di TT take out that support.
Anyway, since there is no portal for the reciever - exactly how does one do this for t BT338 ?
I guess it must be possible as the spec for the receiver says nmea - but I just don't see how
Clues ? Software ? |
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faramoggy Occasional Visitor
Joined: Jun 19, 2004 Posts: 17
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Posted: Thu Oct 13, 2005 9:35 am Post subject: |
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Thought it should be fine. Taken from the spec for the BT338
GPS Output Data NMEA 0183 protocol, and supports command:
GGA(1sec), GSA(1 sec), GSV(5 sec), RMC(1sec)
( VTG and GLL are optional)
GPS transfer rate 38400,N,8,1
gad this is infuriating |
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Darren Frequent Visitor
Joined: 11/07/2002 14:36:40 Posts: 23848 Location: Hampshire, UK
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Posted: Thu Oct 13, 2005 9:55 am Post subject: |
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faramoggy wrote: | OK, flipant your answer may be, but actually it makes a whole load of sense: a firends reciever (which is nmea only) works fine, and TT3 pretty well does sirf. mmmmhhh why di TT take out that support.
Anyway, since there is no portal for the reciever - exactly how does one do this for t BT338 ?
I guess it must be possible as the spec for the receiver says nmea - but I just don't see how
Clues ? Software ? |
Google for SiRFDemo.exe, you can then use this on a PC to switch the BT338 back to NMEA output. _________________ Darren Griffin |
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faramoggy Occasional Visitor
Joined: Jun 19, 2004 Posts: 17
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Posted: Thu Oct 13, 2005 11:12 am Post subject: |
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Thanks,
Found SirfDemo, but the usb BT dongle on my PC gives it ports of 18 and 22. SirfDemo only allows you serial ports of 1-12. I will try it on my laptop at home later.
Just beware about the sirfdemo port limitation
Don't suppose there is anything useful like an equivalent program for pocketpc ?
Old adage is true ...
"never let anything mechanical or electrical know you are in a hurry" |
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Darren Frequent Visitor
Joined: 11/07/2002 14:36:40 Posts: 23848 Location: Hampshire, UK
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Posted: Thu Oct 13, 2005 11:20 am Post subject: |
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faramoggy wrote: | Thanks,
Found SirfDemo, but the usb BT dongle on my PC gives it ports of 18 and 22. SirfDemo only allows you serial ports of 1-12. I will try it on my laptop at home later.
Just beware about the sirfdemo port limitation |
That's not SiRFDemo's fault, it will give you the next available COM Port, in your case the lower numbers must be allocated already, many dongles create a raft of BT Services and allocate COM Ports to them regardless of whether you need or use them.
For a PocketPC solution try Winfats Navigator CE Monitor which can be downloaded here. _________________ Darren Griffin |
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faramoggy Occasional Visitor
Joined: Jun 19, 2004 Posts: 17
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Posted: Thu Oct 13, 2005 12:34 pm Post subject: |
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Illuminati
Many thanks for all the help - especially Lutz for that not so dumb question. I finally found some software to switch the BT338 mode to NMEA and all is well.
For ref, the software is freeware called "GPSTweak" and can be downloaded from
http://sirftweak.networktroubles.org/gpstweak.php
Just copy the appropriate exe to your PPC and run
Another piece of software is "SirfDemo" which runs from PC
http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=25575
Now why couldn't TomTom have put a means to switch when migrating from TT3 !
Graham |
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