【整理】RTS/CTS，DTR/DSR的区别

有空再整理。

待参考：

RS-232

Flow Control

这个解释的不错：

What is the difference between DTR/DSR and RTS/CTS flow control?

Difference between RS232 Hardware Flow Control RTS/CTS and DTR/DSR

这个也值得看看：

DCD DSR DTR RTS CTS表示什么意思

COM RTS/CTS, DTR/DSR

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