介绍了一种用RS485构成的总线型的数据采集系统，包括上位机PC一台和下位机AT89C52单片机若干，下位机可以进行单独测量，也可以与上位机组成网络进行远程测量，整个系统使用灵活方便，具有很大的实用性。-Introduction of a composition using RS485 bus-based data acquisition system, including the Host PC Units 1 and the next bit plane number of AT89C52 single-chip, the next-bit machine can separate measurements, with the host computer for remote measurement of the composition of the network, the entire system flexibility, and it is very practical.