地震勘探仪器的RS-485高速数据/能量传输

RS-485 bus-based high-speed data/power transmission method for seismic exploration instruments

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。

An RS-485 bus-based high-speed serial data transmission system was developed for high-speed remote long wire transmission of a large amount of data collected by seismic exploration instruments using FPGA technology. The system structure and communication protocols are given. The power in the Ethernet is used to drive the RS-485 bus with transmission of the 48 V DC and data signals via the same twisted-pair electric cable. The rising/falling edges of the serial signals are used as the start symbols for high-speed clock sampling to enable bit synchronization time-clock recovery and data frame recognition with the 8 B/10 B encoded mode. The sampting clock frequency is 10 times higher than the sending clock signal. Data transmission experiments show that the system provides remote data transmission along a 220 m twisted-pair cable at transmission rates of up to 20 Mb/s with an error rate of 10-11.