有一点很重要，那就是要使用零调制解调器电缆，如果您使用普通的串行电缆，目标计算机则期望与串行设备通信，而不是与另一个串行端口通信，这样您就无法调试该计算机。
It is important that you use a null modem cable; if you use a typical serial cable, the target computer expects a serial device and not another serial port, and you cannot debug the computer.
零调制解调器 (Null modem) 是一种使用 RS-232 串行电缆连接两台计算机的通信方式。
Null modem is a communication method to connect two computers directly using a RS-232 serial cable.
它是一种可以同时处理计算机与具有USB接口的多种外设之间通信的电缆总线，USB已成为目前PC标准的通用串行总线。
It is a kind of cable bus which can process the communications between computer and peripheral equipments. USB is a general serial bus with PC standard.
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