【摘要】 为解决数字垂直地震剖面(vertical seismic profilingr,VSP)系统中各采集节点间同步性差、布线复杂等问题,提出一种基于RS485总线时分复用技术实现地震数据并行同步采集的设计方案。方案中各采集节点均并行挂接在RS485总线上,选择RS485的通信B线作为同步信号线,将其与各采集节点的控制器中断口相连接。数据采集时,首先将同步采集指令通过通信B线以广播方式发送到各采集节点,实现各节点同时启动ADC转换,然后通过RS485总线将采集的数据传送到采集站,最后由采集站通过以太网将数据传送到上位机,实现地震数据的并行同步采集。实际应用表明:该方案不仅提高采集节点间的同步性,还提高系统的可靠性,同时也减少系统布线。更多还原

【Abstract】 To solve the problem of synchronous acquisition between acquisition nodes is poor,complex wiring in digital VSP system,puts forward a design which is based on RS485 bus timedivision multiplexing implement seismic data acquisition in parallel synchronous. Each node in this scenario is articulated in parallel on the RS485 bus, select RS485 communication line B as synchronous signal line,it connected with the interrupt port of each acquisition node controller.When data acquisition,firstly,synchronous collection instructions through the communication line B are sent to each acquisition node in broadcast way,in order to make each node at the same time start the ADC conversion,then transmit the data to acquisition station via RS485 bus,and finally the acquisition transmits the data to the host computer, and implement seismic data acquisition in parallel synchronous. Actual application shows that the scheme not only improves the acquisition synchrony between nodes, but also improve the reliability of the system,meanwhile,reduces system wiring更多还原