UMTS/HSPA Module Series
WCDMA UGxx AT Commands Manual
WCDMA_UGxx_AT_Commands_Manual Confidential / Released 12 / 247
1.5. Unsolicited Result Code
As a report message, URC (Unsolicited Result Code) is not issued as part of the response related to an
executed AT command. URC is issued by the module without being requested by the TE and it is issued
automatically when a certain event occurs. Typical events leading to URCs are incoming calls ("RING"),
received short messages, etc. The AT command AT+QCFG="urc/port" could list all available port(s) and
the current port. This command also can disable URC indication of a specified port.
1.6. Turn off Procedure
It is recommended to execute AT+QPOWD command to turn off the module, as it is the safest and best
way. This procedure is realized by letting the module log off from the network and allowing the software to
enter into a secure and safe data state before disconnecting the power supply.
After sending AT+QPOWD, do not enter any other AT commands. The module outputs message
“POWERED DOWN” and sets the STATE pin as low to enter into the shutdown state. In order to avoid
data loss, it is suggested to wait for 1s to switch off the VBAT after the STATE pin is set as low and the
URC “POWERED DOWN” is outputted. If “POWERED DOWN” has not been received after 65s, the
VBAT shall be switched off compulsorily.
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