User Manual

GSM/GPRS Module Series
GC10 Hardware Design
GC10_Hardware_Design Confidential / Released 25 / 76
turned off. An OC driver circuit is suggested to control the PWRKEY. A simple reference circuit is
illustrated as below:
Figure 7: Turn On the Module with an OC Driver
GC10 module is set to autobauding mode (AT+IPR=0) by default. In the autobauding mode, URC “RDY”
is not reported to the host controller after module is powered on. When the module receives AT command,
it will be powered on after a delay of 5~6 seconds. Host controller should first send the “AT” string in order
that the module can detect baud rate of host controller, and it will continuously send 1~5 “AT” string until
receiving “OK” string from the module. Then enter “AT+IPR=x;&W” to set a fixed baud rate for the module
and save the configuration to flash memory of the module. After these configurations, the URC “RDY”
would be received from the UART port of the module every time when the module is powered on. For
more details, refer to the section “AT+IPR” in document [1].
The other way to control the PWRKEY is through a button directly. A TVS component is indispensable to
be placed nearby the button for ESD protection. For the best performance, the TVS component must be
placed nearby the button. When pressing the key, electrostatic strike may generate from finger. A
reference circuit is shown in the following figure:
Figure 8: Turn On the Module with a Button
NOTE