1.AT Commands Format
l Every AT command starts with ‘AT’ and ends with Carriage Return (CR, encoded to 0x0D in the ASCII character set) and Line Feed (LF, encoded to 0x0A in the ASCII character set).
2.Throughput Mode and AT-Command Mode
Feasycom bluetooth module works in throughput mode by default.
l Throughput mode (when TPMODE=1) means that there would be transparent transmission after Bluetooth connection established. After power on and initialization completed, FSC-BT671 automatically enters AT-command state, then the host MCU can send AT commands to the module. When the module gets connected with another Bluetooth device, it automatically enters throughput state, every byte received from the host MCU will be entirely delivering to remote Bluetooth device without any change, so does the reverse direction. In other words, the FSC-BT671 enters AT-command state when disconnected, enters throughput state when connected.
l AT-command mode (when TPMODE=0) means that feasycom bluetooth module works in AT-command state at any time after power on and initialization completed.
For more details feel free to Contact Feasycom Team .