21
AT commands summary
As a conclusion, the table below shows the most common and useful AT commands.
For more AT commands refer to [1].
Action
Syntax
Response
Comments
Echo enable
ATE1
OK
Typed text is seen.
Echo disable
ATE0
OK
Typed text is not seen.
Voice call
ATD<phoneNo>;
OK
Call initiated.
Remember of ';'
NO CARRIER/BUSY/NO
ANSWER
Connection failure.
+CME ERROR: <err>
General error*
OPERATION NOT
ALLOWED
Security reason (such as SIM
card not inserted)
UNKNOWN CALLING
ERROR
Unknown reason
Hung up call
ATH
NO CARRIER
Connection is hanged up.
Receiving call
ATA
OK
Call is answered.
Communication
loss
NO CARRIER
Enter PIN code
AT+CPIN=[<puk>
or <pin>],
[<newpin>]
OK
Set PIN or PUK or new PIN
code.*
+CME ERROR: <err>
General error*
Check PIN code
status
AT+CPIN?
+CPIN: <code>
OK
Returns status of PIN.
e.g. READY or SIM PIN
+CME ERROR: <err>
General error*
*
Refer to [1].
Summary of Contents for RB900-Pro
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Page 5: ...5 References 1 Quectel_EC25 EC21_AT_Commands_Manual_V1 1 pdf...
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