Siemens TC37 Module At Command Reference page 149

AT Command Set
Read command Response
AT^SBC? ^SBC: <bcs>,<bcl>,<mpc>
<bcs>
<bcl>
<mpc>
Write command Use the write command to specify the power consumption of your external
application. This information enables the ME to calculate the average power
AT^SBC=
consumption <mpc> and to properly control the charging process. If the value is
<current>
not correct the entire charging process may be affected. Resulting problems may
be wrong responses to the AT^SBC read command, overcharging, or the battery
does not reach full capacity.
The write command registers the serial port as the output channel for unsolicited
result codes related to charging.
When the ME is powered down or reset, the value of <current> is restored to its
default. This affects the charging control and disables the presentation of
unsolicited result codes. Therefore, the parameter should be set every time when
needed after rebooting the ME.
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
Parameter
<current>
TC3X_ATC_01_V04.00
Connection status of battery pack
Battery charge level
While charging is in progress (charging adapter connected) the
battery capacity is not available. Consequently, parameter < bcl > =0.
To query the battery capacity disconnect the charger.
Average power consumption
<mpc> is obtained from the ME's power consumption, plus the value
you have specified for the application by using the write command
AT^SBC=<current>. Remember that the ME's power consumption
varies with its operating mode (IDLE, TALK, DATA) and the power
level.
If <current> was not yet specified and no battery pack NTC is
detected <mpc> returns
consumption.
If <current> was not yet specified, but the NTC of the connected
battery pack is detected, an offset value of 200mA will, by default, be
added. 200mA is an estimated value which represents the power
consumption of a typical external application. Drawn from practical
experience it serves as a precaution to ensure proper charging in
case you have not entered <current>. It is strongly recommended
that you enter the correct power consumption of your application as
described below.
Note: If the battery does not incorporate an NTC, or the battery and
the NTC are not compliant with the requirements specified in [1], the
battery cannot be detected by the ME.
Enter the current consumption of your application in mA (0...5000). If
used, the current provided over the by 2.9V VDD pin of the ZIF
interface (maximum 70mA) must be added, too.
Page 149 of 204
only the module's present power
29.05.2002