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。
Through the free port mode communication protocol, accelerate the speed of communication between PLC, has met the systematic demand.
小区采集器与单元采集器及用户煤气表通过自由口通信方式组成分布式网络。
The district collector, the unit collector and user's gas meter made up the distributed network.
通过上位机pc与PLC以自由口方式串口通信实现PC对PLC的实时监控，并用PLC对温度、压力进行控制。
Realtime control between PC and PLC is realized through serial communication by freeport mode, and the control of temperature and pressure is realized by PLC.
详细介绍了在自由口模式下S7- 200PLC与计算机实现串行通信的方法，重点介绍了通信协议及其实现方法，并给出了编程实例。
How to implement serial communication between S7-200 PLC and computer based on free port mode was described in detail in the paper.
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。
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。
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.
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