Under the background of rapid iteration of Internet of Things devices,the demand for short-range wireless communication is increasing.With its low power consumption and high compatibility,Bluetooth module has become a common scheme for data transmission between embedded devices and host computers.
1.Overview of Bluetooth module of BLE-SER serial communication.
This Bluetooth module supports BLE 4.2 protocol at the RF end,and the hardware can be configured in master-slave mode or pure slave mode.If it is set to master-slave integration,the module can automatically initiate connection or bind with the designated slave,which is suitable for the scene of point-to-point automatic networking.Slave mode is suitable for devices waiting for the host to connect,such as sensor nodes.The highest baud rate of serial port can reach 1Mbps,and the baud rate is configured by hardware.At the same time,it fully supports MODEM contact signals(RTS,DTR,DCD,RI,DSR,CTS).For the scene requiring verification,Bluetooth module of serial communication provides odd verification,even verification,no verification,blank 0 verification and mark 1 verification,etc.to meet the communication specifications of different serial devices.
2.BLE-SER serial communication Bluetooth module function.
The core function of BLE-SER Bluetooth-to-serial module is to complete bidirectional data forwarding between Bluetooth signal and UART serial port.This module is designed based on CH9140 chip,which can be directly embedded in the user's terminal products,reducing the development workload of the underlying wireless fidelity.Bluetooth virtual serial port technology is realized in the module-the virtual serial port driver is matched on the computer side,and the system will automatically map the Bluetooth connection to a standard serial port.In this way,the original serial debugging tool or application program of Bluetooth module can communicate with remote devices through Bluetooth module without any modification.Developers don't have to care about the details of Bluetooth protocol stack,so they can upgrade the traditional wired serial port to wireless connection and get rid of the constraints of cable length.
3.Application characteristics of Bluetooth module of BLE-SER serial communication.
①Strong software compatibility:it provides host connection support for mainstream systems such as Windows/Linux/Android/iOS,and PC is equipped with a virtual serial port driver,which is compatible with existing serial port software tools without secondary development.
②Flexible Bluetooth role:Master-slave mode and slave mode are supported,and master-slave mode can be configured with automatic connection or binding.
③Hardware configuration capability:parameters can be configured by hardware,which is convenient for batch deployment.
④Long-distance transmission:the transmission distance is 100 meters in open environment.
⑤Adjustable transmission power:8 gears are adjustable,which is convenient for balancing power consumption and distance.
⑥Ultra-low power consumption:the power-off sleep current is only 0.3μA,which is suitable for battery-powered products.
⑦Wide working voltage:Bluetooth module of serial communication supports 3.3V and 2.5V.
⑧High-speed serial port:The maximum baud rate of asynchronous serial port is 1Mbps,and it supports complete MODEM contact signal.
⑨Rich verification modes:odd,even,none,blank 0,flag 1 and other verification modes are optional.
⑩Additional function:The Bluetooth module of serial communication supports reading the power supply voltage parameters of the chip,which is convenient for monitoring the power supply status.
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