Table 11: Summary Of At Commands Available In Charge-Only And Alarm Mode - Siemens MC35 Command Set

AT Command Set
Unsolicited result code
^SBC: Undervoltage
The message will be reported, for example, when you attempt to set up a call
while the voltage is close to the critical limit and further power loss is caused dur-
ing the transmit burst. To remind you that the battery needs to be charged soon,
the URC appears several times before the module switches off.
When the module is in IDLE mode it takes typically one minute to deregister from
the network and to switch off.
Undervoltage protection in mains operated applications:
· The undervoltage protection is also efficient in applications which are not bat-
Reference Note
· If Multiplex mode is active, any virtual channel can be used to enter the write
Siemens
· The URC "^SYSSTART CHARGE-ONLY MODE" is indicated automatically

Table 11: Summary of AT commands available in Charge-only and Alarm mode

AT command Use
AT+CALA Set alarm time
AT+CCLK Set date and time of RTC
AT^SBC Monitor charging process
Note: While charging is in progress, no battery capacity value is available. To
query the battery capacity disconnect the charger. If the charger connects exter-
nally to the host device no charging parameters are transferred to the module. In
this case, the command cannot be used.
AT^SCTM Query temperature of GSM engine, enable or disable URCs
AT^SMSO Power down GSM engine
MC35_ATC_01_V05.00
tery operated, i.e. in applications where the ACCU_TEMP pin is not con-
nected. To use this feature it is sufficient to issue the write command which
automatically enables the presentation of URCs. You do not need to specify
<current>. Please note, that in contrast to battery powered applications, the
ME will present the undervoltage URC only once and will then switch off with-
out sending any further messages.
command and to specify <current>. The undervoltage URC appears simulta-
neously on all three channels.
when the engine enters this mode (except when autobauding is active). Unlike
the undervoltage URC, it cannot be disabled or enabled by the user.
Page 192 of 256 15.07.2002