EDW-ML8021
GSM GPRS Modem User’s Manual
Page 6
working RF band.
GPRS IDLE
The module is not registered to GPRS network. The
module is not reachable through GPRS channel.
GPRS
STANDBY
The module is registered to GPRS network, but no
GPRS PDP context is active. The SGSN knows the
Routing Area where the module is located at.
GPRS
READY
The PDP context is active, but no data transfer is going
on. The module is ready to receive or send GPRS data.
The SGSN knows the cell where the module is located
at.
GPRS DATA
There is GPRS data in transfer. In this mode, power
consumption is decided by the PCL, working RF band
and GPRS multi-slot configuration.
POWER
DOWN
Normal shutdown by sending the
“
AT+QPOWD=1
”
command, using the
PWRKEY pin. The power management ASIC disconnects the power
supply from the base band 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 VBAT) remains applied.
Minimum
functionality
mode (without
removing power
supply)
Use the
“
AT+CFUN
”
command can set the module to a minimum
functionality mode without removing the power supply. In this case, the
RFpart 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, but the serial port is still
accessible. The power consumption in this case is very low.
Note
: The module is set to auto baud rate mode (AT+IPR=0) in default configuration. In the auto
baud rate mode, the URC
“
RDY
”
after powering on is not sent to host controller. AT command
can be sent to the module 2-3 seconds after the module is powered on. Host controller should
firstly send an
“
AT
”
or
“
at
”
string in order that the module can detect baud rate of host controller,
and it should send the second or the third
“
AT
”
or
“
at
”
string until receiving
“
OK
”
string from
module. If you need to using fixed baud rate, Then an
“
AT+IPR=x;&W
”
should be sent to
module and save the configuration to flash memory of module. After these configurations, the
URC
“
RDY
”
would be received from the Serial Port of module every time when the module is
powered on. Refer to Chapter
“
AT+IPR
”
in AR command manual.
3.3LED indication
3.3.1 Red Led is the power indication.
3.3.2 Yellow Led is the RING indication.
3.3.3 Green Led is the Working state indication.
The Working state of this LED is list in the table 6.
Table 6 Working state indication
