Operating Modes - SimCom SIM802 HD Manual

SIM802 Hardware Design

3.2 Operating modes

The table below briefly summarizes the various operating modes referred to in the following
chapters.
Table 6: Overview of operating modes
Mode
GSM/GPRS
SLEEP
GSM IDLE
GSM TALK
GPRS
STANDBY
GPRS DATA
SRD DATA
POWER DOWN
Minimum functionality
mode (without remove
power supply)
SIM802_HD_V2.01
Function
Module will automatically go into SLEEP mode if DTR is set to high
level and there is no on air or audio activity is required and no
hardware interrupt (such as GPIO interrupt or data on serial port).
In this case, the current consumption of module will reduce to the
minimal level.
During sleep mode, the module can still receive paging message and
SMS from the system normally.
Software is active. Module has been registered to the GSM network,
and the module is ready to send and receive.
Connection is going on between two subscribers. In this case, the
power consumption depends on network settings such as DTX off/on,
FR/EFR/HR, hopping sequences, antenna.
Module is ready for GPRS data transfer, but no data is currently sent
or received. In this case, power consumption depends on network
settings and GPRS configuration (e.g. multi-slot settings).
There is GPRS data in transfer (PPP or TCP or UDP). In this case,
power consumption is related with network settings (e.g. power
control level), uplink / downlink data rates and GPRS configuration
(e.g. used multi-slot settings).
There are two statuses: receive or transmit .Transmitting power levels
can be set up to 4 levels. Power consumption is related with
transmitting power levels.
For details please refer to document [1]
Normal shutdown by sending the "AT+CPOWD" command or using
the PWRKEY. The power management ASIC disconnects the power
supply from the baseband part of the module，and only the power
supply for the RTC is remained. Software is not active. The serial
interfaces are not accessible. Operating voltage (connected to BATT)
remains applied.
Use the "AT+CFUN" command can set the module to a minimum
functionality mode without remove the power supply. In this case, the
GSM RF part of the module will not work or the SIM card will not be
accessible, or both RF part and SIM card will be closed all, and the
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