User's Manual

HC-08 BLUETOOTH UART COMMUNICATION MODULE USER MANUAL
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⑨ Revise RF power
Set command: AT+RFPM=x
Query command: AT+RFPM=?
X:RF power, as shown in the following table:
Parameter RF power
? View the current RF power
0 4dBm（default）
1 0dBm
2 -6dBm
3 -23dBm
Example:
Send: AT+RFPM=2
Return: OK
RF power modified -6dBm.
Send: AT+RFPM=?
Return:-6dBm
RF power is -6dBm.
The peak current is more than 30mA (when RF power is 4dBm). Because the small
discharge current button batteries, such as to use the button battery powered, the best
setting for -6dBm or -23dBm.
⑩ Revise UART baud
Set command: AT+BAUD=x（Only modified the UART baud rate）
AT+BAUD=x, y（Modify the UART baud rate and parity bit）
Query command: AT+BAUD=?
x: UART baud rate, y: parity bit, As shown in the following table:
Parameter UART baud :x Parameter parity bit :y
? View the current baud rate
1200 1200bps N
No parity
2400 2400bps E
Even parity
4800 4800bps O
Odd parity
9600 9600bps（default）
19200 19200bps
38400 38400bps
57600 57600bps
115200 115200bps
Example:
Send: AT+BAUD=19200
Return: OK19200
UART baud rate modified for 19200bps.