User Manual

HC‐12WIRELESSRFUARTCOMMUNICATIONMODULEV2.4USERMANUAL
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NOTE
①Do not directly connect the light emitting diode and resistor between the TX and the
power supply side of the module, otherwise it may affect the module UART communication.
②Using MCU to dynamically modify the module parameters, set the module fifth pin
"SET" low level, need to wait for the 40ms to send AT command to the module. Set the fifth pin
"SET" high level, need to wait for the 80ms to enter the UART transmission mode.
Application example and circuit
① HC-12 module connect to the computer UART port
"SET" pin through the switch SW1 grounding can enter the parameter setting state, left
hanging out.
② HC-12 module connect to the MCU UART port
Please set the "SET" control pin to high level or hanging out in normal times, and set to low
level in setting parameters state.