PACSystems CPU用SNP从协议通过端口1或端口2可以和ME软件通讯。CPU端口1作为-个RS-232数据通讯设备(DCE)端口连接，可以直接用直通电缆连接到运行ME或其他SNP主软件的PC的一个串行口。在使用CPU端口2时，该端口采用RS-485连接，需要一个外接电源的RS-232/RS-485变换器(分类号IC690ACC901)，除非SNP主也有–个RS-485端口。
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