From: Johannes Wolf (mp2100_at_mail-gw.estec.esa.int)
Date: Fri Apr 29 2005 - 06:11:16 PDT
Hi DJ,
let me start to answer your last post:
the GPS receiver needs to talk NMEA (as you can see from the programs
settings as well).
The beauty of this data format is that it is plain text.
So you should be able to use a monitor program on the Newt and see the NMEA
sentences like:
$PGALM .... (almanac information)
$PGRMI .... (sensor initialisation information)
and maybe others.
I think first you need to make sure that the hardware interface is ok -
of course this is kind of a nightmare if the handbook is in chinese...
Second you should make sure that both sides are talking at the same speed
and protocol.
Then it is the time to check the NMEA sentences sent by the receiver.
You normally need only one or two sentences, containing the actual position
information.
There is an NMEA $PGRMO command you can send to your receiver
enabling/disabling output sentences.
Finally if everything is fine, the GPS program should work nicely.
I used a monitor program (Hyperterminal) on my PC to figure out the correct
settings (my GPS mouse has a DB9 serial interface ...)
HTH
Cheers,
Johannes
> -----Original Message-----
> From: newtontalk-bounce_at_newtontalk.net
> [mailto:newtontalk-bounce_at_newtontalk.net]On Behalf Of DJ Vollkasko
> Sent: Friday, April 29, 2005 10:24 AM
> To: newtontalk_at_newtontalk.net
> Subject: [NTLK] Newton GPS prob: "GPS: 0" -----
> Hi,
> I've been twiddling around with GPS on my MP2k for the last couple
> days, basically w/o much success. Perhaps you can help me?
> I have a GPS mouse receiver (AQMax AQ-300, manufacturer website
> http://www.aqmax.com/ -- Chinese only, besides a wholesome "About us"
> blurb...), which seems to receive GPS data from GPS satellite (status
> LED switches from "on" for "powered" to blinking mode for "acquiring
> data"). GPS Map alternatively gives me these messages:
> "Waiting for GPS Data!" (i.e. it wants to talk to a receiver...),
> "GPS: n/a" (which means it doesn't get any data, because it can't see
> the receiver...), then after a moment
> "GPS: 0" with a black bar next to it (which means it *does* talk to the
> receiver, but doesn't get any positional data it can use... even though
> the receiver's status LED is blinking!)
> When I try with TeleType GPS in monitor mode, I can see the receiver
> sends something to the Newton. When I'm indoors, this is pretty (pretty
> stable, but also pretty useless as it can't acquire satellite signals,
> right!?), when I'm out of doors it it prettier: it gets a position and
> then returns an error message. After that the GPS receiver doesn't
> transmit anymore, but the Newton is still running and TeleType GPS can
> be normally closed.
> The receiver prefs in GPS Map are:
> GPS Driver: NMEA 183
> Interface Settings
> Port: Serial Port
> Speed: 4800
> Parity: None
> Handshake: None
> Data Bits: 8
> Stop Bits: 1
> UTC Offset: -01:00
> Init String: (blank)
> In Teletype GPS I couldn't find any way to set any settings. (Where are
> they hidden?)
> Do I need to configure the GPS receiver via Init strings? What am I to
> look for?
> How can I troubleshoot the receiver-to-Newton communication problem?
> Any help appreciated.
> D. Vollkasko
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