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Thread: bu-353, sirf/nema, port settings

  1. #1
    Maximum Bitrate kbyrd's Avatar
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    bu-353, sirf/nema, port settings

    Several related questions.
    I've got a bu-353 USB gps mouse. I'm using GPSgate to try and clear up a resume from standby problem (sometimes when resuming I get no VGA signal, unplugging the GPS solves this for me, so does using something like GPS gate)

    Do I want to use sirf or nema? MapMonkey supports either, but I think the GPS is now stuck in sirf mode and I can't use NEMA any more. How do I switch?

    Does using a port splitter like GPSgate mean I have to nema?

    What are the port settings I should use for the Prolific USB->serial driver?

    What are the proper port settings (baud, parity, etc) for both modes? I think this device is 4800 baud for nema, but I can't find info for Sirf.

    Thanks.
    My worklog.
    Status: VM GTI sold, got out of the CarPC tinkering hobby, but I still think about getting back in.

  2. #2
    Maximum Bitrate kbyrd's Avatar
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    bump...with some new information.
    I searched the usglobalsat site (they make the bu-353) and found their support forums, one of the thread has a link to sirfdemo. It appears to be a really low level too.

    Point it at your com port, do "Action->Open Source", then "Action->Synchronize...", it should settle on 57600 baud.
    Before you exit this app, be sure you do "switch to NEMA mode" otherwise your GPS will be stuck in sirf mode.

    So, my remaining questions:
    - Why use nema vs. sirf?
    - Can I use a xport3 or GPS gate with sirf?
    - Do the settings in device manager for the prolific usb-serial driver matter? What are the correct settings?
    My worklog.
    Status: VM GTI sold, got out of the CarPC tinkering hobby, but I still think about getting back in.

  3. #3
    What can I say? I like serial. Curiosity's Avatar
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    XPort3 doesn't really do anything with the data. It just broadcasts it virbatim, so it might work. Try it, I guess. Everything used with it would have to be set to sirf as well though.

  4. #4
    Variable Bitrate Fox_Mulder's Avatar
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    Quote Originally Posted by kbyrd
    Before you exit this app, be sure you do "switch to NEMA mode" otherwise your GPS will be stuck in sirf mode.
    I accidently did this, I tried connecting, nothing, So I did the "Action->Synchronize" thing and it got me back in, then I changed it back to NMEA, pheww thought I screwed up my GPS reciever! thanks for that info!

    [edit] Is the 353 WAAS/EGNOS Enabled?
    Fox Mulder
    2004 Toyota MR2
    Intel Dual Core 2.0Ghz 1Gb DDR2 160GB SATA2 M4ATX Lilliput 7" TS BU353 DiNovo Mini Car2PC ODBII Bluetooth HF 16x2 Character LCD

  5. #5
    Maximum Bitrate kbyrd's Avatar
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    Quote Originally Posted by Fox_Mulder
    [edit] Is the 353 WAAS/EGNOS Enabled?
    It's supposed to be, but I think only the "firmware 3.1.1 updated" ones are. I got mine from Logic Supply (mp3car doesn't sell them) and it's 3.0.2.
    My worklog.
    Status: VM GTI sold, got out of the CarPC tinkering hobby, but I still think about getting back in.

  6. #6
    Variable Bitrate Fox_Mulder's Avatar
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    Just checked the FW on my 353 and got
    "SW Version GSW3.1.1LowV_3.1.00.07-C23B1.00"
    which I presume means mine is WAAS/EGNOS/SBAS enabled.
    Also Static Nav is disabled by default, whilst http://www.gpspassion.com/forumsen/t...TOPIC_ID=25575 says it should be enabled by default. Hmmm strange.... ah well I'm not complaining, 7 Sat Lock from downstairs with heavy rain / lightning outside!
    Fox Mulder
    2004 Toyota MR2
    Intel Dual Core 2.0Ghz 1Gb DDR2 160GB SATA2 M4ATX Lilliput 7" TS BU353 DiNovo Mini Car2PC ODBII Bluetooth HF 16x2 Character LCD

  7. #7
    Maximum Bitrate DeltaFX's Avatar
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    Although some apps do support sirf, nemea is human-readable (you can say your gps is working simply by looking what it says with hyperterminal), and both have the same update rate, 1hz.
    Settings in NMEA mode are 4800baud, 1 start bit, 1stop bit, no parity check.
    GPSgate only deals with NMEA sentences @ 1hz

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