为了满足现在大型核物理实验中数据传输的需要,设计了一种基于RS-485、异步串口通信协议的长距离数据传输系统；系统采用现场可编程门阵列(Field programmable gate array,FPGA)作为主控芯片,在FPGA的内部实现异步串口通信协议编解码、时钟数据恢复,同时使用RS485收发芯片Max3467来增强差分信号的驱动能力,提高了该系统在长距离数据传输中的可靠性；目前该系统可以20.48 Mbps的单线波特率在100 m双绞线电缆上实现无误码数据传输.%A long distance data transmission system based on RS-485 and Universal Asynchronous Receiver/Transmitter (UART) is designed for long distance data transmission in large physics experiments.This system used Field Programmable Gate Array (FPGA) as main control chip.UART and Clock Data Recovery (CDR) were implemented in FPGA.And the chips,Max3467,were used to drive electric signal on cables.All these improved reliability of the system in data transmission part.This system worked on 100 meters long cable and at data rate of 20.48 Mbps with no errors.
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