MLB-G1101 DTU User Guide
10
Rev 1.1
1.4
Main Features and Services
The MLB-G1101 performs a set of telecom services (TS) according to GSM standard phase 2+, ETSI
and ITU-T. The services and functions of the MLB-G1101 are implemented by issuing customized
applications embedded on the device, or by AT commands issued internally, or over the RJ45 to
RS232 serial interface.
1.4.1 Operating Modes
The table below briefly summarizes the various operating modes referred to in the following chapters.
Normal
operation
GSM / GPRS
SLEEP
Various power save modes set with AT+CFUN command. Software is
active to minimum extent. If the module was registered to the GSM
network in IDLE mode, it is registered and paging with the BTS in SLEEP
mode, too. Power saving can be chosen at different levels: The NON-
CYCLIC SLEEP mode (AT+CFUN=0) disables the AT interface. The
CYCLIC SLEEP modes AT+CFUN=7 and 9 alternately activate and
deactivate the AT interfaces to allow permanent access to all AT
commands.
GSM IDLE
Software is active. Once registered to the GSM network, paging with
BTS is carried out. The module is ready to send and receive.
GPRS IDLE
Module is ready for GPRS data transfer, but no data is currently sent or
received. Power consumption depends on network settings and GPRS
configuration (e.g. multi-slot settings).
GPRS DATA
GPRS data transfer in progress. Power consumption depends on
network settings (e.g. power control level), uplink / downlink data rates,
GPRS configuration (e.g. used multi-slot settings) and reduction of
maximum output power.
POWER
DOWN
Normal shutdown after sending the AT^SMSO command. Only a voltage regulator is
active for powering the RTC. Software is not active. Interfaces are not accessible.
Operating voltage (connected to BATT+) remains applied.
Airplane
mode
Airplane mode shuts down the radio part of the module, causes the module to log off from
the GSM/GPRS network and disables all AT commands whose execution requires a radio
connection. Airplane mode can be controlled by using the AT commands AT^SCFG and
AT+CALA:
• With AT^SCFG=MEopMode/Airplane/OnStart the module can be configured to enter the
Airplane mode each time when switched on or reset.
• The parameter AT^SCFG=MEopMode/Airplane can be used to switch back and forth
between Normal mode and Airplane mode any time during operation.
• Setting an alarm time with AT+CALA followed by AT^SMSO wakes the module up into
Airplane mode at the scheduled time.
Table 1: Operating Modes
