FX16 Master Controller Technical Bulletin
114
Troubleshooting
GSM Modem Not Able to Send SMS #1
• Error/Condition: The GSM modem is not able to send SMS.
• Problem: This happens when the GSM modem field is not powerful
enough. The GSM field needs to be strong enough to ensure proper
communication. The problem can be due to the positioning of the
antenna.
• Solution: To verify the GSM signal strength, send the modem the
AT command (AT + CSQ) via a connected computer. See Table 27.
Table 27: AT Commands
AT+CSQ response (RSSI) Signal Quality
11 to 31
Sufficient
0 to 10 and +99
Insufficient
GSM Modem Not Able to Send SMS #2
• Error/Condition: The GSM modem is not able to send SMS.
• Problem: This happens when the SIM card is inserted into a GSM
modem is not enabled for SMS/DATA transmission.
The problem can be due to the wrong SIM card configuration.
• Solution: To verify the SMS sending operation, you can send to the
modem the AT command (AT + CMGS) via a connected computer.
Verifying the SMS Sending Operation
To verify the SMS sending operation:
1. Send the AT-CMGS=<SIM Phone Number> (for example,
0039333922222) command.
2. Press
.
3. When the > symbol appears, enter the message text and
terminate the string with a CRTL-Z command. For example:
> typeyourSMStext (CTRL-Z)
4. If the SMS is sent, the following message appears on your
computer.
+CMGS: 192
OK
5. If a NO CARRIER message appears instead of the OK
message, contact your mobile phone provider.
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