Cep Terminals GSM/GPRS TERMINAL CT63 JAVA 6203 用户手册

5.7 Shutdown

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wm_java_usersguide_v19

Page 30 of 109

2012-01-27

Confidential / Released

If an unexpected shutdown occurs, data scheduled to be written will get lost due to a buffered 
write access to the flash file system. The best and safest approach to powering down the mod-
ule is to issue the AT^SMSO command. This procedure lets the module log off from the network 
and allows the software to enter a secure state and save all data. Further details can be found 
in 

The ME is switched off automatically in different situations:
•

under- or overtemperature

•

under- or overvoltage

Appropriate warning messages transmitted by the ME to the host application are implemented 
as URCs. To activate the URCs for temperature conditions use the AT^SCTM command. Un-
dervoltage and overvoltage URCs are generated automatically when fault conditions occur. 

For further detail refer to the commands AT^SCTM and AT^SBC described in the AT Com-
mand Set 

. In addition, a description of the shutdown procedures can be found in 

The module can be switched off manually with the AT command, AT^SMSO. In this case the 
midlets destroyApp method is called and the application has 5s time to clean up and call the 
notifydestroy method. After the 5s the VM is shut down.

When the module is switched off without setting an alarm time (see the AT Command Set 

), 

e.g. after a power failure, external hardware must restart the module with the Ignition line (IGT). 
The Hardware Interface Description 

 explains how to handle a switched off situation.

The Watchdog class allows to access the HW watchdog of the system from application level. 
Depending on the setting (at^scfg) the userware watchdog can do nothing, switch-off or reboot 
the system.