SerialI/0协议只有在CPU运行时才能激活，因为它完全是被应用程序中COMM_ REQ功能驱动。当CPU停止时，串行VO的端口配置将恢复到停止模式协议。按照CPU配置的端口设置中指定的停止模式，停止模式可以由RTU从或SNP从来设置:缺省是RTU从。Serial/0支持的COMM_ REQ功能块不被当前现有的协议支持(像SNP从和RTU从等)。如果这些COMM_ REQ功能块被用于一个由不支持COMM_ REQ功能块的协议配置的端口，送回错误信息。
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