One IBM serial null modem cable
一根 IBM串口直连线缆（serial null modem cable）。
A null modem cable is a serial cable that allows data to be sent between two serial ports.
零调制解调器电缆是一种允许在两个串行端口之间发送数据的串行电缆。
It is very important that you have the correct null modem cable with you to set up the debugging environment.
为了设置调试环境，拥有正确的零调制解调器电缆是非常重要的。
Before starting, make sure that you have connected the null modem cable between the development and target machines.
开始之前，请确保已使用零调制解调器电缆将开发计算机和目标计算机连接起来。
A null modem cable connected between the serial ports of the two systems is used to transmit heartbeats between the two nodes.
两个系统的串口之间的直连线缆用来在两个节点间传输heartbeat。
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.
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.
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。
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