User's Guide

MP280B User’s Guide
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3. Transparent protocol
The transparent transmission mode of the module means that the universal serial port
is connected to the user CPU to establish two-way communication between the user CPU
and the mobile device. The module will have different data throughput capabilities for
different serial port baud rates and BLE connection intervals, as well as different packet
delivery intervals. In order to coordinate the use of low-speed CPU, the default baud rate
is 9600bps. In applications with large data volume transmission or high real-time
requirements, it is recommended to set the high-speed serial port baud rate to 115200bps.
When the module BLE connection interval is 20 ms and the serial port baud rate is
115200 bps, the module has the highest theoretical forwarding capability (4K/S).
The module can transmit up to 200 bytes of data packets from the serial port at one
time. The module will automatically send packets according to the packet size. The
maximum payload of each wireless packet is 20 bytes. Packets sent by the mobile device
to the module must be sent by themselves (1-20 bytes/packet). After receiving the
wireless packet, the module will forward it to the serial port receiving end of the host.