Recommended Timeout Mechanism For At Commands Processed By A Host - Huawei ME909u-523 Application Manual

HUAWEI ME909u-523 LTE LGA Module
Application Guide
Example:
AT+COPS=1,2,23415
OK
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
Example:
AT+CREG?
+CME ERROR: SIM failure
1.2.3 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
General AT commands
AT+CMSS/AT+CMGS (used to send text
messages)
AT+COPS=? (used to search for networks)
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.
2.
3.
Issue 04 (2014-12-08)
HUAWEI ME909u-523 LTE LGA Module AT Command Interface
NOTE
SIM failure indicates that SIM card is not inserted.
The host sends AT to the module.
If the module returns failure information, go to step 5.
If the module returns success information, the module is functioning normally.
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Before the results ofAT+COPS
is returned, enter any characters
(such as "AT"), the module will
terminate the processing of
AT+COPS and return OK. The
entered characters are used to
abort the command only
Timeout Duration
30s
60s
120s
Overview
.
Specification.
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