基于proteus仿真试验环境下的pic16F877a单片机,组成的RS485总线的仿真程序.按下仿真中的铵钮开关一次,分机1号收到返馈并使能数码管,按二次,分机2号...,调试完成.-Based on pic16F877a MCU, proteus simulation test environment composed of RS485 bus simulation program. Press the push button switch of the simulation of a, extension 1 can receive feedback and make the digital tube, according to the quadratic, engine no. 2..., commissioning is complete.