User Manual
HC‐12WIRELESSRFUARTCOMMUNICATIONMODULEV2.4USERMANUAL
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PAGE 5
Here are some of the characteristics of the reference value of a variety of modes:
mode FU1 FU2 FU3 FU4 note
idle work current 3.6mA 80μA 16mA 16mA average value
transfer delay 15~25mS 500mS 4~80mS 1S Send 1 bytes
loop delay
measurement 1
31mS The UART baud rate of 9600，
Send 1 bytes
loop delay
measurement 2
31mS The UART baud rate of 9600，
Send 10 bytes
Note: the test loop delay is short circuit the module of the TX and RX pins, sending UART
data to another module, sending UART data to another module of TX pin for this period of time
to return to the data from the beginning.
Module parameter setting AT command
AT command is used to set the parameters of the module and switch the function of the
module. At the same time, the parameters and functions of the modification, power off will not
be lost.
⑴ To enter into the AT command mode
The first entry way - the normal use (already on the power), the fifth pin "SET" set the low
level.
Second entry way - power off, the fifth pin "SET" connect to ground (low level), then
power on.
These two ways can make the module into the AT command mode, release ("SET" pin is
not connected to the low level) then exit the command mode. After exiting the AT command
mode, if you change the function of the module, you will be cut to the corresponding functional
status.
Second ways to fix the 9600, N, 1 of the UART format into the command mode.
Note: after the withdrawal of the AT command mode, the module is in a reset state, at least
wait for 200mS before entering the AT command mode again, otherwise the module may into the
AT command mode in second way!