Through serial port on PC, VB program exchange data with peripheral devices to c ollecting data and control equips, the event-driven and query communication is briefly introduced by examples.

• 利用PC机提供的串行端口，可用VB编写的程序与外界设备交换数据，达到数据采集和设备控制的目的；以实例形式介绍了事件驱动和轮询两种通讯处理方式.