程序运行环境：



下位机：dsPIC30F6014A

上位机：串口调试助手

RS485芯片：MAX489



通信方式：PC机 --- RS232转RS485 --- RS485接口 --- dsPIC30F6014A



通信内容：PC机发送一串字符（约定以“回车”结束）给下位机，下位机接收后不做任何处理返回给PC。-Environment for running programs: The next bit machine: dsPIC30F6014A Host Computer: Serial RS485 chip debugging aids: MAX489 means of communication: PC,--- RS232 switch to RS485--- RS485 interface--- dsPIC30F6014A the content of communications: PC, send a string of characters (have agreed to " Enter"　end) to the next crew, the next crew, after receiving no treatment returned to the PC.