RS485串口通信试验(接受与发送) * 1.通过本例程了解串口的基本原理及使用 ,理解并掌握对串口进行初始化* 2.请使用串口调试助手（Baud 4800、数据位8、停止位1、效验位无）做为上位机(发送)数据和(接受)数据， 请在字符串输入框中输入字符和数字(HEX),按发送按钮。观看接受窗显示情况.也可以用自动循环发送。 3.试验RS485需要用RS232转485的转换头。RS485的A对应串口头的9针 B对应4针.接法大家可以参考原理图。 * * * 请学员认真消化本例程，学会用C语言操作串口和485的实现

rs485.c

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