User's Manual

HF-BL100-CU Low Energy Bluetooh（BLE 4.0）Module User Manual
Shanghai High Flying Electronics Technology Co., Ltd www.hi-flying.com - 18
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3. UART TRANSPARENT TRANSMIT
MODE
3.1. Transparent Transmit Mode
Transparent Transmit means the two way communication between device and mobile terminal
via the connecting with serial interface and device MCU. Device can set HF-BL100-CU baud
rate and connect interval via AT command through serial interface (refer to “ Serial AT
command Description” for details). Target different baud rate and BLE connect interval or
different packet sending interval, module would have different data handling capacity. The
default baud rate of HF-BL100-CU is 115200bps, it is recommended to set baud rate at
115200bps when transmitting big data or in highly real-time application. Baud rate support
save after power off.
Figure 6. Basic HF-BL100-CU wireless network structure
Module BLE connect interval is 20ms, and able to send utmost 200 byte data one time via
serial interface. Theoretically module able to send data up to 4KB/S. Below is the detail
description about transparent transmit.
Module can receive utmost 200 byte data from serial interface one time. Module will
automatically send sub-packet according to data size, each packet limit is 20 bytes. The data
packet sending from mobile device to module must separated to sub-packet(1-20 byte each).
After receive the sub-packets, module will send to MCU in proper order.
Serial hardware protocol:：115200 bps , 8, non-parity，1 stop bit 。