Alarm Mode; Shut Down; Automatic Shutdown; Restart After Switch Off - Siemens TC45 User Manual

TC45 TC45 JAVA User's Guide
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3.3 Alarm mode

The ALARM can be set by the at+cala AT command. Please refer to the AT Command Set
[4] and Hardware Interface Description [5] for more information. One can set an alarm,
switch off the module with at^smso, and have the module restart in ALARM mode at the time
set with at+cala. Only a limited number of AT commands are available when the module is in
ALARM mode. The JVM is active in ALARM mode when autostart is activated. A Java
application must be able to handle the ALARM mode and reset the module to reinstate the
normal mode.
The ALARM mode is indicated by URC "SYSSTART ALARM MODE".
Note: When a Java application is started in ALARM mode only AT Command API's without
CSD are available. The indicating URC is created after issuing the very first AT command on
any opened channel.

3.4 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].

3.4.1 Automatic shutdown

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 URC is activated, the module will deliver the URC before switching off. The
AT command at^sctm is used to activate and configure the overheating URC. It is
recommended that this URC be activated so that the module can be shut by the application
with at^smso after setting an alarm, see Section 3.3. Please note that there is no URC
function available for overvoltage conditions, i.e. no alert will be sent before shutdown. The
conmands are described in the AT Command Set [4] while a description of the shutdown
procedure can be found in [5].

3.4.2 Restart after switch off

The module can be switched off with the AT command, at^smso without setting an alarm
time, see the AT Command Set
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.
TC45_JAVA User's Guide_V02
[4]. A power failure will also switch off the module. When the
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