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.
原始rs- 232标准只定义了使用调制解调器连接计算机的方式。
The original RS-232 standard only defined the connection of computers with modems.
原始rs- 232标准只定义了使用调制解调器连接计算机的方式。
The original RS-232 standard only defined the connection of computers with modems.
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