Eddy Wireless ML8011 User Manual - page 9
ML8011 GSM GPRS Modem User’s Manual
Page 9
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.
3.4.2 Power down module using the PWRKEY pin
Customer’s application can turn off the module by driving the PWRKEY to a high level voltage
for certain time. The power-down scenario is illustrated as in Figure 4.
Figure 4 Timing of turn off the module
The power-down procedure causes the module to log off from the network and allows the
software to save important data before completely disconnecting the power supply, thus it is a
safe way. Before the completion of the power-down procedure the module sends out the result
code shown below:
NORMAL POWER DOWN
After this moment, no further AT command can be executed, and then the module enters the
POWER DOWN mode, The POWER DOWN mode can also be indicated by STATUS pin,
which is a low level voltage in this mode.
3.4.3 Power down module using AT command
Customer’s application can use an AT command “AT+QPOWD=1” to turn off the module. This
command will let the module to log off from the network and allow the software to save
important data before completely disconnecting the power supply, thus it is a safe way.