Shut Down; Automatic Shutdown; Restart After Switch Off - Siemens TC65 JAVA User Manual

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TC65 JAVA User's Guide

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5.5

Shut Down

In the case of an unexpected shut down, data that should be written will get lost due to a

buffered write access to the flash file system. However, the best and safest approach to

powering down the module is to issue the AT^SMSO command. This procedure lets the

engine log off from the network and allows the software to enter into a secure state and save

all data. Further details can be found in [5].

5.5.1

The module is switched off automatically in different situations:

• under- or overtemperature

• under- or overvoltage

This will happen without a warning notification unless the appropriate URC has been

activated. If the URCs are enabled, the module will deliver an alert before switching off. To

activate the URCs for temperature conditions use the at^sctm command, to activate the

undervoltage URC use the at^sbc command. It is recommended that these URCs be

activated so that the module can be shut by the application with at^smso after setting an

alarm, see Section 5.4. Please note that there is no URC function available for overvoltage

conditions, i.e. no alert will be sent before shutdown. The commands are described in the AT

Command Set [4], while a description of the shutdown procedure can be found in [5].

5.5.2

The module can be switched off with the AT command, at^smso without setting an alarm

time, see the AT Command Set [4]. A power failure will also switch off the module. When the

module is switched off, external hardware must restart the module with the Ignition line (IGT).

The Hardware Interface Description [5] explains how to handle a switched off situation.

TC65 JAVA User's Guide_V01

Page 26 of 69

11.03.2005

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