Westermo GD-01 - Manual (Page 204)

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Trouble shooting/FAQ
GD-01 Frequently Asked Questions
1. How do I disable/enable the PIN code?
Start with inserting your PIN code with AT+CPIN=xxxx
Use the command . xxxx is the PIN code on your SIM card.
To enable the PIN code again, replace the 0 with 1.
2. How do I send a text message with SMS by activating DTR?
Please refer to application example section
3. It does not work to establish a connection from my PSTN modem to GD-01
Probably the subscription doesn’t support data connection in both directions.
Check with the GSM network operator that the appropriate services are enabled
on the specific subscription (SIM card)
4. How can I see the bearer of the incoming call.
Set the command AT+CRC=1 in the GD-xx. It will show the type of incoming call:
+CRING: ASYNC
+CRING: REL ASYNC
+CRING:VOICE
Call to the GD-xx. If the incoming call is VOICE you will know that it is not possible
to establish a data connection. Call your SIM card provider/operator and ask them to
change the subscription so that it will support data in both directions.
5. The modem does not answer through the serial link
The list below shows the most frequent possible couses for such behaviour
• Is the modem correctly powered on?
(see table under section “Connections”)
• Is the serial cable suitable and adjusted in both ends
(see table under section “Connections ”)
• Check that the communication program is properly configured.
• Does any other application interfere with your communication program
(conflict on communication port access)
6 The modem always return “Error” when trying to issue a communication
Issue AT+CMEE=1 to have extended error cause retry
Refer to the +CMEE command AT-command list in this manual to see the possible
errors reported
B A C K