单片机、计算机多机应用系统中经常要进行远距离串行通讯，文章提出了一种单片机、计算机远距离串行通讯的简单实用方法，并给出一个实际应用系统。采用此方法后，远端通讯机间仅需一条双绞线。布线经济简单，通讯距离可提高到几公里。且传输速率快，误码率低。 Singlechip, computer multi-machine applications often have long-distance serial communication, the paper presents a simple, practical method of single-chip computer, computer long-distance serial communication, and gives a practical application system. With this method, only one twisted pair is needed between the remote comms. Wiring economy is simple, communication distance can be increased to a few kilometers. And the transfer rate, low bit error rate.