With the RS232 serial port, the different kinds master slave system of AC converters can communicate with PC under the USS protocol.

多类型变频器通过RS2 32串行口通讯，在USS通讯协议下，就可以与工控机联网。

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So for example, it could be that the MDM system is the master and the transactional systems are the slave systems.

例如，MDM系统是主系统，而事务性系统是从系统。

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For availability, this computing system was a redundant design, with two sets of processors and buses and the ability to switch between a master and a slave if the master was found to be unresponsive.

就可用性而言，这个计算系统是一个冗余设计，有两组处理器和总线，能够在主机无应答的情况下在主机和伺服机之间进行切换。

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