Exception Handling; Module Reset; Module Going To Dump Status - Huawei MU609 Application Manual

HUAWEI MU609 HSPA LGA Module
Application Guide

19.3 Exception Handling

In the industrial product design, in order to ensure reliable operation of the device for
a long time, the host need take into account fault-tolerant design. This is because
that the operation of the terminal environment is very complex and not easy to design
the system architecture for complete simulation. Since the environment maybe
change, and the various hardware components within the device are not always
guaranteed to work at the expected condition, even if the module is able to maintain
the electrical specifications claimed to work, but the external signal may also lead to
abnormal changes in the module beyond the normal working condition. For example,
the power supply voltage drop may cause the module reboots, so we recommend in
the system design customers should consider the types of abnormal events, and add
a corresponding recovery process, so that the module can be restored after a brief
interruption to the normal communication.

19.3.1 Module Reset


In some extreme condition (for example, the power voltage is not stable), the module may
be reset.

The module will report "^SYSSTART" to the host.

After the module reset, the host need reconfigure the configuration, and reconnect
the data service, if the module was connected to network before resetting. If the
module is connected to network by embedded protocol IP stack or external protocol
stack, the host need reconnect too.

For the data service reconnected by external protocol stack, please take the following
two steps.
Step 1 Input AT+CGDCONT=1,"IP","1234"
Step 2 Input ATD*99#
For detail, please refer to Chapter 4 External Protocol Stack Application Scenarios.

19.3.2 Module Going to Dump Status


In some
status, it cannot response to any ATcommand, and its USB port status is not the same as
normal status.

Any AT command input will have no response, and the module only has two USB ports.

Issue 02 (2013-09-18)
Exception Description
How to Detect the Exception
Host Resume Steps
Host Resume Example
Exception Description
extreme condition, the module may go to dump status to protect itself. In this
How to Detect the Exception
Host Resume Steps
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by the Host
by the Host
Appendix
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