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Cinterion
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Java Terminal Hardware Interface Description
3.11 Automatic thermal shutdown
40
PLS62T-W_HID_v01
2018-06-20
Confidential / Prelimenary
Page 37 of 91
3.11
Automatic thermal shutdown
An on-board NTC measures the temperature of the built-in Java module. If over- or undertem-
perature is detected on the module the Java Terminal automatically shut down to avoid thermal
damage to the system.
specifies the ambient temperature threshold for the Java Ter-
minal.
The automatic shutdown procedure is equivalent to the power-down initiated with the AT^SM-
SO command, i.e. Java Terminal log off from the network and the software enters a secure
state avoiding loss of data.
Alert messages transmitted before the Java Terminal switch off are implemented as Unsolicit-
ed Result codes (URCs). For details see the description of AT^SCTM command provided in
The watchdog can be configured to restart the Java Terminal after a defined period of time.
3.12
Hardware Watchdog
The Java Terminal feature a programmable hardware watchdog that permanently monitors the
terminals hardware and can be configured to react to various hardware states. The watchdog
may for example be configured to periodically restart the terminal, independent of its current
operating state.
shows how the watchdog is integrated into the Java Terminal.
Please refer to
for details on how to control and configure the hardware watchdog.
3.13
RTC
The internal Real Time Clock (RTC) of the Java Terminal retains the time and date and handles
the alarm function. The AT+CCLK command serves to set the time and date, and AT+CALA
specifies a reminder message or sets an alarm for the .Java Terminal to wake up. See
for
details.
A dedicated voltage regulator backs up the RTC even in Power Down mode and enables Java
Terminal to keep track of time and date.
However, please note that the Alarm function described in
, Section AT+CALA, will only work
if there is no “auto ignition“ connection active between IGT_IN pin and PLUS pin at the power
supply unit that will automatically trigger a restart (see
). Otherwise, the AT+CALA
command can only be used to set a reminder message, but not to configure the Java Terminal
to wake up from Power Down mode.