Specifications

HM-BT4502 V1.0
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RX ("RS" corresponds to hexadecimal 0x5253).If the instruction format is
correct, the confirmation string "TTM: OK\r\n\0"will be received from TX. If the
format is incorrect, the "TTM: ERP\r\n\0" will be received.
Note: This ID code will be saved on power failure. It can be used to filter the
device or determine whether it is a specific product in the advertisement.
9.12 Tx Power Setting
Input the following string to the serial port RX. Set the corresponding Tx power.
The unit is dBm.
"TTM: TPL-(X)"
Among them, X="+10",“+6”,"0","-6",”-10”,"-20" (the above data formats are
ASCII codes). For example, “TTM:TPL-(+6)” means that the Tx power is
+6dBm. If the instruction format is correct, the confirmation string "TTM:
OK\r\n\0" will be received from TX, and the module will immediately run the
new Tx power to communicate. If the format is not correct, the "TTM:
ERP\r\n\0" will be received.
Note: This parameter is not saved on power failure.
9.13 RSSI Signal Strength Output
Input the string "TTM: RSI-ON" to the serial port RX. Open the RSSI output.
The signal strength outputs periodically, the time interval is 1 second.
Input the string "TTM: RSI-OFF" to the serial port RX. Close the RSSI output.