总线制串行传送的多路数据采集技术的研究

Study on Multichannel Data Acquisition Technique via Series Model Bus Transfer

本文提出了一种新颖的总线制串行传送的多路数据采集技术,多至256个传感器或探测器,配备上编码器和信号转换电路后,挂接到两条信号总线和一条公共地线上去,可实现多路编码寻址与测试数据采集。通讯距离可达数百至数千米。它的突出优点是当传感器或探测器分散布置在较长距离上时,可简化布线和节省大量传输线。从某种角度上说,可提高系统的抗干扰能力与可靠性。该技术已应用于火灾自动报警系统中传送分级的频率信号,取得了满意的结果,证实了它的实用性。

This paper presents a new multichannel data acquisition technique through series model bus transfer. When not more than 256 transducers or detectors are used and their coders and signal conversion circuits are connected between each of the two signal wires and a ground wire, multichannel coded addressing and testing data acquisition may be implemented. The communication range may reach as far as thousands of meters. There are some outstanding advantages in this technique, such as simplifying arrangement of wires and saving transfer wires in case of the transducers or detectors being distributed in a long distance.We have applied this technique to a fire auto-alarm system. The experimental result shows that our method is practical.