摘要：RS232／485串口总线是一种久远但目前仍常用的通信方式。随着工业测控行业的发展，多数的仪器、单片机、PLC都提供了串行通信接口。开发串口通信的编程语言很多，但应用最普遍、功能最强大的还是C语言。
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