Through the free port mode communication protocol, accelerate the speed of communication between PLC, has met the systematic demand.
通过自由口通信协议，加快PLC之间的通信速度，满足了系统的要求。
Two modes of communication, one is PPI master - slave protocol, one is free port protocol.
通讯方式主要有两种：PPI主从通讯、自由口模式通讯。
The free-port program with special communication protocol of intelligent instrument is used in the scheme, not only network structure is simplified but also wire laying is saved.
该方案将自由口编程完全采用智能仪表的特定通信协议，既简化网络结构，又节约布线。
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