Nemerix chip datum

slink · Lifetime Member Joined: Oct 09, 2004 Posts: 16

Hi,
Has anyone got a listing of Nemerix chip control codes. I believe they start $PNMRX, followed by the instruction number and its data. I have been able to change the NMEA stream rates OK, but my GPS is consistently giving an offset of approx 50 metres north and 20 metres west (compared with either my Roadangel or my GPS III) - which I guess is the wrong datum setting.
According to the supplied software, it seems the datum is controlled by $PNMRX106 with data of 216 to set WGS 84. However, this is giving this error when I send it, so I am trying to find if there's been an update in the chip datum list, but not the driver software!
Cheers,
Steve.

lbendlin · Posted: Tue May 31, 2005 10:44 pm Post subject:

I thought the chipset identifier is three letters, as in $PSRF or $PXEM. Can you try that?
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slink · Lifetime Member Joined: Oct 09, 2004 Posts: 16

Hi Lutz,

Thanks for your idea! I am not sure what to try for Nemerix - perhaps NMX or something? However, I think the code is OK, as if I use $PNNMRX108 to set the NMEA data stream iteration rate, this works ok.

I have just tried sending a raw datum setting to the GPS (i.e. USER DATUM, with the WGS84 figures inserted), but I now need to go out into the rain to get a good signal and test it Sad

I cannot find any information on the data commands on the web, the Nemerix website has no information, and I cannot find any updates to their Control Tool Lite that came with the unit, which contains all these codes - I wonder if the chipset has been updated, but shipped with an old software CD.

I shall keep on playing with it, as it is a lovely, small unit that seems to last very well on its rechargeable battery, but all this is no good if it gives the wrong position!

Steve.

FloatingFatMan · Occasional Visitor Joined: May 18, 2005 Posts: 9

I had similar problems with my Nemerix chipped BT-77. In the end, sending a factory reset from the supplied utility fixed the offset problem.

neiko · Occasional Visitor Joined: Aug 01, 2004 Posts: 10

Hi, i have a copy of the software version 0.93 if it's any use to you?

Drikus · Occasional Visitor Joined: Jun 12, 2005 Posts: 4

If possible i woul dlike a copy asswell

Drikus · Occasional Visitor Joined: Jun 12, 2005 Posts: 4

http://members.home.nl/r.winder/Bluetooth_GPS_102.pdf scrolldown for datacmds..

Drikus · Occasional Visitor Joined: Jun 12, 2005 Posts: 4

And the control tool http://members.home.nl/r.winder/Bluetooth_NctLite.exe altough i am not able to get it work on comport 14... where mine ppp slave BT-GPS connection should be..

Geremia · Occasional Visitor Joined: Jul 28, 2005 Posts: 1

Hi all, first post

i got today a nemerix bluetooth gps from ebay, and started investigating:)

take a look here, some imput command explained

http://www.infortech.net.cn/pdf/WD-N101.pdf

ISP mode is not explained very well, it sound something like in sistem programming or what?!!?
I also opened mine, and saw that there is something like a serial connection available (vcc, gnd, rx, tx) but don't know already if rs232 or ttl.

krafte · Occasional Visitor Joined: Jul 30, 2005 Posts: 1

Hi, first post too,

got any further with the problem?

My bt-gps worked well when i got it from ebay, but after i pushed the factory reset button in nemerix control tool, i have the same problem with offset. it shows now a position 100m north of me Crying or Very sad

, and more worse it doesn't react on changing the datum in nclite tool, the positions just stays the same.

I think I'll write to the nemerix support tomorrow, hope they can help Sad

Gfr · Posted: Thu Aug 25, 2005 5:10 am Post subject: Nemerix Problems

Hi all. First post 2. 8)

I bought a Nemerix chip GPS receiver on eBay (user aktronix), last week.

Perfect shipment, the package was ok... But...
I had the same problem: an offset on the real position.

Well... I used the Nemerix Control Tool Lite before using GPS receiver on the mobile phone, just to test it. I DID NOT pushed "Factory reset" or "Datum" or "Set NMEA" buttons. When I linked the receiver to the mobile phone, TomTom or Route66 did not work.

There was this "strange" offset. Moreover the altitude was wrong.
Look @ this video:

http://www.gianfrancoreppucci.com/GPS/100_1858.MOV

I contacted the seller, who told me that this was the first case of malfunction. I contacted Nemerix support too, but there was no reply.

Annoyed of this, today I mounted my notebook in the car and started a test session. Arrived in an open space place, I opened the Nemerix Control Tool Lite and sent the "Factory Reset" code to the GPS receiver;
then rebooted it. After 2 or 3 minutes, the GPS fixed 8 satellites (and that was "normal": it fixed a lot of satellites even if the track was wrong).

Even if the altitude was wrong again, I tried opening TomTom... AND...
It seems to work right, now! I can't believe it.

I will repeat a lot of testing sessions... If you can, use the NCTL to reset the GPS with factory settings, and restart it many times...

I think that the factory reset and the first boot after it must be done in a very open space... Try doing so...

Feedbacks are welcome.

dave_bass5 · Posted: Fri Aug 26, 2005 4:49 pm Post subject:

I also cant get NCTL to connect on com14 from my pc.
only com 1-3 seems to work.
anyone got any ideas?
im using the lattest widcomm drivers

Dace.

Gfr · Posted: Fri Aug 26, 2005 9:21 pm Post subject:

Try using the Hyper Terminal client provided by Windows

Gfr · Posted: Fri Sep 02, 2005 4:10 pm Post subject:

UPDATE: Nemerix Tech Support replied me.

>> Dear Gianfranco,
>>
>> Probably this issue is due to the wrong Datum, but there are something
>> need to be confirm.
>> 1) Is the GPS Bluetooth BT-77 from WondeProud?
>> 2) What's the software version number? You can find the version number
>> using hot-start command.
>> 3) Did you have been change the setting(Datum)?
>>
>> The attached file is V1.0.5 of NctLite, the old version can not change
>> the
>> Datum setting, because the Datum command was changed, there are few
>> method can remove from the wrong Datum.
>>
>> 1) Please change the Datum to WGS84 using NctLite R1.0.5.
>> 2) Press the Factory button can change the Settings to default, the
>> default
>> Datum is WGS84.
>> 3) Open the case of BT-GPS, and remove the backup battery for few
>> seconds,
>> the Settings will change to default too.
>>

They sent me the NCTLITE V1.0.5.

If you are interested, I can give it to you.

lbendlin · Posted: Fri Sep 02, 2005 5:14 pm Post subject:

we most definitely are. If you can send it to me I'll post it in the downloads section.
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