本文介绍了传统水情自动测报系统建设方法及该项目的建设需求,提出了现地传感器复用技术的设计原则,详细阐述了4~20 mA、Modbus-RTU、脉冲量等常规信号的复用方案及实现方法,并结合工程说明了RS-485总线信号衰减、噪声干扰、浪涌干扰等问题的解决方法。经工程应用实践,该方案设计合理,系统运行稳定。 This paper introduces the construction method of traditional hydrofoil measurement system and the construction requirements of the project, and presents the design principle of the reuse of local sensors. It elaborates on the reuse of conventional signals such as 4-20 mA, Modbus-RTU and pulse quantity Solutions and implementation methods, combined with the project described the RS-485 bus signal attenuation, noise interference, surge interference and other issues to solve. The project application practice, the program design is reasonable, the system is stable.