Data Sheet

Smart Machine Smart Decision
SIM800F_Hardware Design_V1.00 23 2015-07-31
Figure 12: Timing of power on module
If a fixed baud rate was set, when power on procedure is completed, SIM800F will send following URC to
indicate that the module is ready to operate:
RDY
This URC does not appear when auto baud detect function is active.
Note: Users can use AT command “AT+IPR=x” to set a fixed baud rate and save the configuration to non-volatile flash memory.
After the configuration is saved as fixed baud rate, the Code “RDY” could be received from the serial port every time when
SIM800F is powered on. For details, please refer to the chapter “AT+IPR” in document
[1]
.
4.2.2 Power off SIM800F
SIM800F will be powered off in the following situations:
 Normal power off procedure: power off SIM800F by the PWRKEY pin
 Normal power off procedure: power off SIM800F by AT command “AT+CPOWD=1”
 Abnormal power off: over-voltage or under-voltage automatic power off
 Abnormal power off: over-temperature or under-temperature automatic power off
4.2.2.1 Power off SIM800F by the PWRKEY Pin
Users can power off SIM800F by pulling down the PWRKEY pin for more than 1 second then release.
The power off sequence is illustrated as below:
Figure 13: Timing of power off SIM800F by PWRKEY