字符您看到应该会出现在该终端窗口…祝贺您，您刚才提出了“环回线”，你得到了引脚分配正确的。
The characters which you see should appear back in the terminal window... Congratulations, you have just made a "loop back cable", and you have got the pin assignments correct.
第二个和第三个环回测试线港口当地DCE和远程终端设备。
The second and third loopbacks test the line ports of the local DCE and the remote DTE.
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