© CES Wireless Technologies Corp
– 2007 Page
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Parameter 2
0: not registered, ME is not currently searching a new operator to register to
1: registered, home network
2: not registered, but ME is currently searching a new operator to register to
3: registration denied
4: unknown
5: registered, roaming
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If the desired response is not received please discuss the programming of the SIM card
with your cellular service provider.
If the desired response is received but there is still an issue then the GPRS Activation needs to be
verified.
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Click on the Verify GPRS Activation button in the Query Commands section.
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The modem’s response will be “$NETIP:” followed by 3 IP Addresses. For example, the
modem should return something similar to this:
$NETIP: "166.214.220.151", "066.102.163.232", "066.209.010.202"
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If AT$NETIP returns all zeros, send the following command: AT$CGEER. This can be
done by typing the command into the “Command to send” field in the Other section on
the Query Commands view. There are three common responses:
$CGEER: no PDP reject cause (Everything should be working OK)
$CGEER: requested service option not subscribed (APN is incorrect or SIM has
not been enabled for data mode.)
$CGEER: user authentication failed (username and/or password is incorrect.)
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If these three IP Addresses are not returned received please discuss the programming of
the SIM card with your cellular service provider. The information form the CGEER
command may assist the carrier in determining the cause of the issue.
A2.3 Verifying the GPS205 has Acquired a GPS Satellite Fix
To verify that the GPS205 has established a acquired a GPS Satellite fix follow these steps. Please note
that it does take a few minutes for the GPS receiver to acquire a fix the first time. After that it should
acquire a fix fairly quickly.
Is the antenna attached?
Does the antenna have a clear view of the sky? The GPS205 cannot establish a GPS fix if the
antenna is inside a building or if the sky is obscured by trees, buildings, tunnels, etc. It is also
quite difficult for it to establish a fix if the antenna has only a partial view of the sky (i.e. it is near
a window).
In the GPS205S, Select Function section select Query Commands. This selection is only
displayed when the software is in Manual Mode.
In the Query Commands section click on the “GPS?” button.
The modem will reply in the text box at the bottom of the software. If you do not get a reply from
the modem verify that has power (12V) and that the correct serial port is selected in the software.
Modems response: the modem responds with a series of sentences that are produced by the
internal GPS receiver. Of particular interest is the “$GPRMC” sentence which should be the next
to last sentence that is produced.
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“$GPRMC,,V,,,,,,,,,,N*53” is a sample of an invalid sentence.
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“$GPRMC,042159.00,A,2835.1039,N,08118.3645,W,000.0,000.0,090407,03.7,W,A*03”
is a sample of a valid sentence.
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For information on the “GPRMC” sentence please search the internet. Entering “GPRMC
Sentence”, without the quotes, into your favorite search engine will return the desired
results.