1 ASCII Command Interface

The RNBD451 module is primarily controlled through ASCII commands sent from the host MCU to the UART interface. These ASCII commands enable the management of various functions, including but not limited to connection setup/teardown, accessing Generic Attribute Profile (GATT) characteristics, modifying configuration settings, reading status and querying status information.

The UART interface on the module can operate in two modes:
  • Command mode – Configured to receive and process ASCII commands from the host MCU
    Note: The RNBD module requires a defined processing time to respond to each command. Ensure that the host waits for the corresponding response before sending the next command. Do not issue a new command until the previous command response is received.
  • Data mode – Facilitates the exchange of data using the “Transparent UART” Bluetooth service