终端对时对于绝大多数数据同步单元来说是一种通用特性，它允许模块通过外部源进行对时。利用终端对时特性，按照如下连接即可实现双通道：在通常模式中，来自多路复用器? 数据模块 1 的发送定时输出连接到 UR–RS422 接口的时钟输入上，同时，数据模块 1 的发送定时输出也将并联到数据模块 2 的终端对时输入上。
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