以 PC 作为上位机，以调制解调器（Modem）、串行打印机、各种监控模块、PLC、摄像头云台、数控机床、单片机及智能设备等作为下位机广泛应用于测控领域。本文详细介绍利用 LabVIEW 实现 PC 与各种下位机设备串口通信的程序设计方法。-PC as the host computer to the modem (Modem), serial printer, a variety of monitoring modules, PLC, camera head, CNC machine tools, microcontrollers and intelligent devices as the next machine is widely used in the field of measurement and control. This paper describes in detail the use of LabVIEW PC and a variety of lower computer equipment serial communication programming method.