Specifications

HM-BT4502 V1.0
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If the setting is successful, the confirmation string "TTM: OK\r\n\0" will be
received from TX. If the instruction format is incorrect, the "TTM: ERP\r\n\0"
will be received.
If RSSI output function is turned on, RSSI signal strength string "TTM:
RSI-xx\r\n\0"is output every one second.
For example, RSSI is - 63dBm.The output string is "TTM: RSI-63\r\n\0"
Note: This parameter is not saved on power failure, and RSSI output is
automatically closed after disconnection.
9.14 RTC Setting and Getting
Input the string "TTM: RTC-xxxxxxxxxxxxxx" to the serial port RX and set the
RTC time. The format is that Year is 4 bits, Month, Day, Hour, Minute and
Second is 2 bits respectively.
For example, January 2, 2017, at 3:4:5, the output string is "TTM:
RTC-20170102030405\r\n\0"
If the setting is successful, the confirmation string "TTM: OK\r\n\0" will be
received from TX. If the instruction format is incorrect, the "TTM: ERP\r\n\0"
will be received.
Input the string "TTM: RTC-?" to the serial port RX and get the RTC time.
If the setting is successful, the string "TTM: RTC-xxxxxxxxxxxxxx\r\n\0" will be
received from TX. The format is the same as the setting format. If the
instruction format is incorrect, the "TTM: ERP\r\n\0" will be received.