Specifications

Chapter 17 – Hardware-Related Commands
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 279
Examples:
Example 1
URCs issued when the operating temperature is out of range:
^SCTM_B: 1 Caution: Engine close to over temperature limit.
^SCTM_B: 2 Alert: Engine is above over temperature limit and switches off.
^SCTM_B: -1 Caution: Engine close to under temperature limit.
^SCTM_B: -2 Alert: Engine is below under temperature limit and switches off.
Example 2
URCs issued when the temperature is back to normal (URC is output once):
^SCTM_B: 0 Engine back to normal temperature.
Notes:
• Please refer to the “Hardware Interface Description” for specifications on critical temperature ranges.
• To avoid damage the module will shut down once the critical temperature is exceeded.
The procedure is equivalent to the power-down initiated with AT^SMSO.
• URCs indicating the alert level “1” or “-1” are intended to enable the user to take appropriate precautions, such
as protect the module from exposure to extreme conditions, or save or back up data, etc.
The presentation of “1” or “-1” URCs depends on the settings selected with the write command:
If <n>=0: Presentation is enabled for the two minute guard period after the module was switched on. After the
two minute guard period, the presentation will be disabled; i.e., no URCs will alert levels "1" or "-1" will be
generated.
If <n>= 1: Presentation of “1” or “-1” URCs is always enabled.
• Level “2” or “-2” URCs are followed by immediate shutdown, except in cases described in "Deferred
Shutdown" below. The presentation of these URCs is always enabled; i.e., they will be output even though the
factory setting AT^SCTM=0 was never changed.
• This command is not PIN protected.
• This command is supported in airplane mode.
Deferred Shutdown
In the following cases, automatic shutdown will be deferred if a critical temperature limit is exceeded:
• while an emergency call is in progress.
• during a two minute guard period after powerup. This guard period has been introduced in order to allow for
the user to make an emergency call. The start of any one of these calls extends the guard period until the end
of the call. Any other network activity may be terminated by shutdown upon expiry of the guard time.
While in a "deferred shutdown" situation, the engine continues to measure the temperature and to deliver alert
messages, but deactivates the shutdown functionality. Once the guard period is expired or the call is terminated,
full temperature control will be resumed. If the temperature is still out of range, ME switches off immediately
(without another alert message).
CAUTION! Automatic shutdown is a safety feature intended to prevent damage to the module. Extended usage of
the deferred shutdown facilities provided may result in damage to the module, and possibly other severe
consequences.