3）零调制解调连接（ZERO MODEM）: ZERO MODEM处理DTE和DTE设备的对称连接，其连接原理为，一方的传送数据信号为另一方的接收数据信号，一方的控制请求信号为另一...
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当您使用零调制解调器电缆在两台计算机之间建立直接串行连接时，您的电缆必须按下面清单1中显示的方式连接。
When you use a null modem to make a direct serial connection between two computers, your cable must be wired, as shown in Listing 1 below.
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。
Before starting, make sure that you have connected the null modem cable between the development and target machines.
有多种连接方式可供选择，因为标准中并未涵盖零调制解调器连接。
Several wiring layouts are in use, because the null modem connection is not covered by a standard.
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