e.g.:

Send “AT” command to module, and the module returns “OK”.

②

AT+Bxxxx

Change the serial port baud rate. The baud rate can be set to be 1,200bps, 2,400bps,

4,800bps, 9,600bps, 19,200bps, 38,400bps, 57,600bps, and 115,200bps. The default

value is 9,600bps.

e.g.: To set serial port baud rate of module to be 19,200bps, first send “AT+B19200”

command to module, and the module returns “OK+B19200”.

③

AT+Cxxxx

Change wireless communication channel, optional from 001 to 127 (for the wireless

channel exceeding 100, the communication distance cannot be ensured). The default

value of wireless channel is 001, and the working frequency is 433.4MHz. The

channel stepping is 400KHz, and the working frequency of Channel 100 is

473.0MHz.

e.g.:

To set the module to work at Channel 21, first send “AT+C021” command to the

module, and the module returns “COK+C021”. After exiting from the command mode,

the module will work at Channel 21, and the working frequency is 441.4MHz.

Note: As the wireless receiving sensitivity of HC-12 module is relatively high, when

the serial port baud rate is greater than 9,600bps, five adjacent channels shall be

staggered to use. When the serial port baud rate is not greater than 9,600bps, in

short-distance (within 10m) communication, also five adjacent channels shall be

staggered to use.

④

AT+FUx

Change serial port transparent transmission mode of module and three modes are

available, namely, FU1, FU2 and FU3. The default mode of module is FU3, and only

when serial port transparent transmission mode of two modules is set to be the same,

can normal communication be available. For detailed introduction, please see the

above “wireless serial port transparent transmission”.

e.g.:

Send “AT+FU1” to module, and the module returns “AT+0K”.

⑤

AT+Px

Set transmitting power of module, x is optional from 1 to 8, and the corresponding

transmitting power of module is as shown below:

x value

1

2

3

4

5

6

7

8

Transmitting

power of

module

(dBm)

-1

2

5

8

11

14

17

20