This article is a submission from a friend, Han Shijun. If you have excellent articles you would like to submit, feel free to contact me. Everyone relies on network communication every day, but how do these devices communicate with each other? I wrote this article so you can read it from thousands of miles away. … Read more
To better explain this abstract topic, we will analyze the same issue from different perspectives. Remember the story of the blind men and the elephant? Some say the elephant is like a large tree, while others say it resembles a fan. These views are certainly one-sided, but if we gather all these perspectives, we can … Read more
(Click the public account above to quickly follow) Source: Wang Dongyu Link: http://wangdy.blog.51cto.com/3845563/1588379 OSI Reference Model OSI RM: Open System Interconnection Reference Model The OSI reference model has the following advantages: Simplifies related network operations; Provides compatibility and standard interfaces between devices; Promotes standardization efforts; Structurally separable; Easy to implement and maintain. Since the 1960s, … Read more
From the OSI network model perspective, fieldbus networks generally implement only the 1 layer (Physical Layer), the 2 layer (Data Link Layer), and the 7 layer (Application Layer). Because fieldbus typically includes only one network segment, it does not require the 3 layer (Transport Layer) and the 4 layer (Network Layer), nor does it need … Read more