一种基于CH9344芯片的USB转多路串口扩展设计

A USB to Multi-port Serial Port Expansion Design Based on CH9344 Chip

在工业控制领域,串行通信因接线少、成本低而被广泛应用。但目前大多数计算机取消了串口配备。基于此,设计了一种基于CH9344芯片的串口扩展电路,将USB接口转换为UART、RS232、RS485和RS422,所有器件均为国产器件。经实践应用表明,该电路具有成本低、实时性高、抗干扰能力强及性能稳定等优点,可广泛应用于电信、工控、军工等领域。

In the field of industrial control,serial communication is widely used because of less wiring and low cost.But at present the computer canceled the serial port to equip mostly.This paper designs a serial port expansion circuit based on the CH9344 chip,which converts the USB interface into UART,RS232,RS485 and RS42.All the devices are domestic devices.The circuit has the advantages of low cost,high real-time performance and high localization rate,strong anti-jamming ability and stable performance,and can be widely used in securities,telecommunications,industrial control and other fields.