(1)OSI - 3 layer
(2)Master-slave protocol , not event-driven
(3)Advantage: Flexibility capability
(2)Master-slave protocol , not event-driven
(3)Advantage: Flexibility capability
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3UlPZ1T5uwPiJSauwbrMtK12txoq_MYPpZvLzcDgWVGmVBYfr4I0jDXy7aCHGTiylEBCCjQvO37mgiol0nsGKeO4RYkEmYBf5IpHpaNmIJp92sxaDp37RucEpSWA9f8HO8_Y6qN94Qq4/s400/temp.png)
Transmission Mode:
(1) Remote Terminal Unit(RTU): binary 表示
(2) ASCII: 將RTU模式中4位數字結合起來以ASCII儲存
ASCII的優點是可以接受大於1秒的delay(RTU不行),
但同樣的data在ASCII mode下整個message的長度會是RTU模式的2倍
Function code : 04 - read input register
Function code : 04 - read input register
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