Users Manual

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4. Serial Transparent Transmission Protocol Instructions
Serial transparent transmission means that the module connects with the user MCU through a
general-purpose serial port to establish two-way communication between the user MCU and the
mobile device. The module can obtain up to 244 bytes of transmission data from the serial port at a
time. The mobile device can send a data packet with a maximum of 244 bytes to the module each
time. After the module receives the data packet, it will be forwarded and transmitted to the MCU
serial port receiver in turn. Users can modify the basic Bluetooth parameters of the module through
serial AT commands. For details, see Serial AT Commands Description .
4-1. Serial hardware protocol：default 115200bps，8, no parity bit, 1 stop bit;
4-2. In order to save volume, the module adopts TXD/RXD two-wire serial port mode, with no
data flow control added. It is not recommended to set the serial rate too high, in case of packet
loss or error code. 115200bps is recommended or other baud rates no higher than 250000bps;
4-3. The default Bluetooth connection interval of the module is 20ms. If you need to save power
consumption and adopt low-speed forwarding mode, you can adjust the Bluetooth connection
interval through AT commands. The longest Bluetooth connection interval is 2000ms.
5. Serial AT Commands Description
The module will automatically identify and distinguish serial data. The data packet with the
beginning of AT+ will be defaulted as AT command and parsed, and the processing result will be
returned. Therefore, the data in transparent transmission mode cannot start with AT+ character.
5.1. Test Command
Command format： AT+TEST\r\n
Return value： OK\r\n
Content: Send AT test commands, returning value OK indicates module AT
commands tested successfully.
5.2. Query Module Version Command
Command format： AT+VERSION?\r\n
Return value： 0.0.1\r\n
Content: Query the current version of the module and return the current version
number 0.0.1 of the module.