HUAWEI MG323 GSM M2M Module
Description of the Application Interfaces
Issue 06 (2013-06-13)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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Fetch Ext Code in the figure is a file system in the MG323 module.
Before powering on the MG323, make sure that TERM_ON is in High-Z condition.
3.4.3 Power-Off Time Sequence
The MG323 module supports power-off through the TERM_ON interface or the
AT^SMSO command. Figure 3-5 shows the power-off time sequence.
Figure 3-5 Power-off time sequence
The processing of the power-off event depends on the normal stop time of the file system
in the MG323 module. The processing varies with the capacity of the file system.
Do not suddenly turn off the VBAT power when the module is working. It is recommended
to power-off the module before turning off the VBAT power.
3.4.4 RESET
The MG323 module supports hardware reset function. If the software of the MG323
module stops responding, you can reset the hardware through the RESET signal.
After the hardware is reset, the software starts powering on the module and reports
relevant information according to the actual settings. For example, the AT command
automatically reports ^SYSSTART. In this case, the external VIO interface is enabled
and supplies 2.8 V power.
3.5 Signal Control Interface
3.5.1 Overview
The signal control part of the B2B interface in the MG323 module consists of:
Power-on/off (TERM_ON) pin
Hardware reset (RESET) pin
