地震勘探仪器的RS-485高速数据/能量传输
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摘要
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 sampling 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.
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 sampling 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.
引文
[1]罗福龙.地震数据采集系统综述和展望[J].中国石油勘探,2007,2:42-46.LUO Fulong.Review and prospect for seismic data acquisition system[J].China Petroleum Exploration,2007,2:42-46.(in Chinese)
[2]Davor G.Hundreds of megabits@hundreds of meters:Extending the transmission length for LVDS[EB/OL].[2008-09-01].http://www.national.com/nationaledge/sep04/article.html.
[3]Gingerich K.New TIA standard enables multipoint LVDS[J].EDN,2002,47(4):77-80.
[4]How far and how fast can you go with RS-485[R].Maxim Integrated Products,AN3884,2006.
[5]Ted S,Larry S.Pre-emphasis improves RS-485communication[J].EDN,1999,44(12):151-156.
[6]Clark K.Equalization enhances RS-485links[J].EDN,2004,49(4):71-78.
[7]Cheng,K H,Chen C A,Yang W B,et al.A30phase500MHz PLL for3X over-sampling clock data recovery[C]//International Symposium on VLSI Design,Automation and Test.Piscataway:Institute of Electrical and Electronics Engineers Computer Society,2007:1-4.
[8]李成,王鹏,丁天怀,等.RS-485总线的高速串行远距离数据传输方法[J].清华大学学报(自然科学版),2009,49(5):684-687.LI Cheng,WANG Peng,DING Tianhuai,et al.RS-485bus-based high-speed serial remote data transmission method[J].J Tsinghua Univ(Sci&Tech),2009,49(5):684-687.(in Chinese)
[2]Davor G.Hundreds of megabits@hundreds of meters:Extending the transmission length for LVDS[EB/OL].[2008-09-01].http://www.national.com/nationaledge/sep04/article.html.
[3]Gingerich K.New TIA standard enables multipoint LVDS[J].EDN,2002,47(4):77-80.
[4]How far and how fast can you go with RS-485[R].Maxim Integrated Products,AN3884,2006.
[5]Ted S,Larry S.Pre-emphasis improves RS-485communication[J].EDN,1999,44(12):151-156.
[6]Clark K.Equalization enhances RS-485links[J].EDN,2004,49(4):71-78.
[7]Cheng,K H,Chen C A,Yang W B,et al.A30phase500MHz PLL for3X over-sampling clock data recovery[C]//International Symposium on VLSI Design,Automation and Test.Piscataway:Institute of Electrical and Electronics Engineers Computer Society,2007:1-4.
[8]李成,王鹏,丁天怀,等.RS-485总线的高速串行远距离数据传输方法[J].清华大学学报(自然科学版),2009,49(5):684-687.LI Cheng,WANG Peng,DING Tianhuai,et al.RS-485bus-based high-speed serial remote data transmission method[J].J Tsinghua Univ(Sci&Tech),2009,49(5):684-687.(in Chinese)
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