这是一篇分析rs485信号波形的文档，其中的图片是从示波器上截下来的。通信协议使用的pelco_d。-This is an analysis of the document rs485 signal waveform, in which the picture is cut off from the oscilloscope. Communication protocol used pelco_d.

PELCO_D协议和PELCO_P协议编程比较实用，下来可以下载参考-PELCO-P and PELCO-D program