EDW-ML8021
GSM GPRS Modem User’s Manual
Page 5
3. Application interface
3.1Pindescription
Table 3 Pin description
PIN
Name
1,4,6,7,8,9
NC
2
TXD
3
RXD
5
GND
3.2 Operating modes
The table below briefly summarizes the various operating modes referred to in the following
chapters.
Table 4 Overview of operating modes
Mode
Function
Normal
operation
GSM/GPRS
SLEEP
The module will automatically go into SLEEP mode if
DTR is set to high level and there is no 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.
GSM IDLE
Software is active. The module has registered to the
GSM network, and the module is ready to send and
receive.
GSM TALK
GSM connection is going. In this mode, the power
consumption is decided by the configuration of Power
Control Level (PCL), dynamic DTX control and the
