Smart Machine Smart Decision
Figure 12: Timing of power on module
When power on procedure is completed, SIM800H will send following URC to indicate that the module is ready
to operate at fixed baud rate.
RDY
This URC does not appear when autobauding function is active.
Note: User 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” should be
received from the serial port every time when SIM800H is powered on. For details, please refer to the chapter
“AT+IPR” in document [1].
4.2.2.
Power down SIM800H
SIM800H will be powered down in the following situations
：
z
Normal power down procedure: power down SIM800H by the PWRKEY pin.
z
Normal power down procedure: power down SIM800H by AT command “AT+CPOWD=1”.
z
Abnormal power down: over-voltage or under-voltage automatic power down.
z
Abnormal power down: over-temperature or under-temperature automatic power down.
4.2.2.1.
Power down SIM800H by the PWRKEY Pin
User can power down SIM800H by pulling down the PWRKEY pin for at least 1 second and release. Please refer
to the power on circuit. The power down timing is illustrated in the following figure.
SIM800H_Hardware_Design_V1.01
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Содержание SIM800H
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