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为实现地震勘探仪器采集的大容量数据的高速远距离长线传输,比较数据传输方式,提出了RS-485总线的高速串行数据传输方法,应用FPGA技术,研制了数据传输系统。分析RS-485数据传输的影响因素,设计了系统总体结构及传输协议。基于以太网供电原理,采用RS-485总线供电方式,实现48V直流能量与数据沿同一线对的叠加传输。利用串行信号的跳变沿作为高速时钟采样的起始标志,结合8B/10B的链路编码方案,实现位同步时钟恢复与数据帧提取,且检测时钟频率10倍于发送时钟频率。数传实验结果表明,系统可实现串行编码数据流以20Mb/s沿220m双绞线电缆的远距离数据传输,误码率可达10-11。
In order to realize high-speed and long-distance long-distance transmission of large-capacity data collected by seismic exploration instruments and to compare data transmission methods, a high-speed serial data transmission method of RS-485 bus is proposed. A data transmission system is developed by using FPGA technology. Analyze the influencing factors of RS-485 data transmission, and design the overall system structure and transmission protocol. Based on the principle of power supply in Ethernet, RS-485 bus is used to supply power, and 48V DC energy is superimposed on the data along the same line. Using the edge of the serial signal as the starting mark of the high-speed clock sampling, combined with the 8B / 10B link coding scheme, the bit-synchronous clock recovery and data frame extraction are realized, and the detection clock frequency is 10 times the sending clock frequency. The experimental results show that the system can achieve long-distance data transmission of 20Mb / s serial 220mb / s along 220m twisted-pair cable with a bit error rate of 10-11.