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Troubleshooting
20
Troubleshooting
For example, response +csq: 31, 99 means that the signal strength is excellent.
If the signal is weaker than -95 dBm (the <rssi> parameter is 9 or less), move the terminal to another
location. If the terminal does not receive a stronger signal, contact your service provider. Anexternal
antenna may improve the reception.
The PIN code is blocked
If entering the PIN code fails three times successively, the code is blocked. You can unblock it by
entering your PUK (Personal Unblocking Key) code. The PUK code may be supplied with the SIM card. If
not, contact your local service provider for the code. If you lose the code, contact your service provider.
When the PIN code is blocked, light indicators 3 and 4 blink. To unblock the code, proceed as follows:
• In the HyperTerminal connection window, type the AT command
at+cpin? and press ENTER. If
the PUK code is required, the response is
+cpin: SIM PUK.
• Enter the PUK code with the command at+cpin="PUK","PIN" where PUK is your PUK code and
PIN your old or new PIN code. Press ENTER.
The HyperTerminal connection does not function
If you do not get an OK response when you enter at in the HyperTerminal connection window, first
check that the port settings are correct (see ”Figure 1. Port settings” on page 14).
It is also possible that your PC or software is incompatible with the terminal. Contact your PC and
software dealers for advice.