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HUAWEI ME909u-521 LTE LGA Module
Application Guide
Overview
Issue 01 (2013-07-05)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
12
Example:
AT+COPS=1,2,23415
OK
Before the results ofAT+COPS
is returned, enter any characters
(such as"AT"), the module will
terminate the processing of
AT+COPS and returnOK. The
entered characters are used to
abort the command only .
Some commands can be executed when SIM card is inserted. It would return to SIM
failure if SIM card is not inserted. For more information, see Property Description of
related AT in HUAWEI ME909u-521 LTE LGA Module AT Command Interface Specification.
Example:
AT+CREG?
+CME ERROR: SIM failure
Note:
SIM failure indicate that SIM card is not inserted.
1.3.3 Recommended Timeout Mechanism for AT Commands
Processed by a Host
A module processes AT commands in series. Do not send another AT command
before the result for the current command is returned or the current command times
out (except when the current command is an abortive AT command). The following
table lists AT command timeout durations (starting from the time when an AT
command arrives at a port).
Table 1-1 AT command timeout duration
AT Command
Timeout Duration
General AT commands
30s
AT+CMSS/AT+CMGS (used to send text
messages)
60s
AT+COPS=? (used to search for networks)
120s
After an AT command times out, it is recommended that the host check whether the
module is functioning normally. The following procedure is provided for your
reference:
1. The host sends AT to the module.