
© CES Wireless Technologies Corp
– 2007 Page
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Appendix 2
– Troubleshooting
All the troubleshooting steps require the GPS205S to be in “Manual Mode”. To enable this mode select
the Program menu and select “Mode – Manual”. If this selection is not shown the software is in this mode
already. The software can return to automatic mode by selecting the Program menu and then selecting
“Mode – Auto”.
A2.1 Verifying the GPS205 has Established a GSM Connection
To verify that the GPS205 has established a GSM connection follow these steps.
Is the antenna attached?
Is the SIM card installed? The SIM card must be installed to establish a connection.
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 “Verify GSM Status” 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 “+CREG: followed by two parameters, comma
separated.
o
The desired response is “+CREG: 0,1” or “+CREG: 0,5”.
o
Parameter 1
0: disable network registration unsolicited result code
1: enable network registration unsolicited result code
2: enable network registration and location information unsolicited result code
+CREG
o
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
o
If the desired response is not received please discuss the programming of the SIM card
with your cellular service provider.
A2.2 Verifying the GPS205 has Established a GPRS Connection
To verify that the GPS205 has established a GPRS connection follow these steps.
Is the antenna attached?
Is the SIM card installed? The SIM card must be installed to establish a connection.
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 “Verify GPRS Status” 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 wi
th “%CGREG: followed by two parameters, comma
separated.
o
The desired response is “%CGREG: 0,1” or “%CGREG: 0,5”.
o
Parameter 1
0: disable network registration unsolicited result code
1: enable network registration unsolicited result code +CGREG
2: enable network registration and location information unsolicited result code
+CGREG