如果一个主SNP,像一个程序器，开始与端口之间通信，则用RTU从协议配置好的端口能切换到SNP协议。为了能够被识别，该程序器必须使用与当前激活的RTU从协议相同的串行通信参数(波特率，奇偶，停止位等)。当CPU识别主SNP时，从端口中移除RTU从协议并安装SNP Slave作为活动协议。在这种情况下安装的SNP协议具有下列确定的特性:SNP ID设置为空。因此SNP主必须使用一个SNP附属信息中的空ID。这也意味着这种能力只对点对点连接有用。
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