fieldbus communication

Communication Algorithm 9: Link-level simulation of communication systems, communication system links I. Physical Layer baseband simulation The link-level simulation of the communication system can be divided into five parts. 1. System Parameters 2. Sender Algorithm 3. Channel Model 4. Receiver Algorithm 5. St

Communication network technology is a technology for planning, designing, constructing and maintaining networks. To build and maintain a communication network well, you must understand the structures, interfaces, protocols, and technical indicators of various types of communication networks, and understand the relationships and connections between various

:#include #include #include #include #include #include #include #include #include #include Char buf[100];void Main (void){int Cltsock, Len, err;struct Sockaddr_un cltaddr;struct Sockaddr_un seraddr;int ret;Cltsock = socket (Af_unix, sock_stream, 0);if (Cltsock {printf ("Socket creat error!!! \ n ");Return}memset (cltaddr, 0, sizeof (CLTADDR));cltaddr.sun_family = Af_unix;sprintf (Cltaddr.sun_path, "CLT");Len = offsetof (struct Sockaddr_un, Sun_path) + strlen (Cltaddr.sun_path);Unlink (Cltaddr.su

-expensive. Therefore, if the message is not too large, or can consider parity and checksum, if too large, first consider Crc8, and then consider CRC16 and CRC32, do not cut a pole.I²c communication is generally used only on board level, but now there is a trend for fieldbus. At the beginning of the design is to support multi-master multi-Slave, two hosts can send information at the same time, the host wins

Before I begin, I'd like to describe what this so-called communication program is all about. The communication program is similar to a weak version of QQ, login needs to register, after successful login, you can achieve instant communication, group chat, private chat, but also can be transmitted documents. Let's get to the last picture Server side: Client Login:

Let me introduce some of the issues that need attention when designing communication services. 1, the use of short-chain, or long-chain. The advantages of short-chain can be guaranteed to a certain extent the number of concurrent services, each communication is completed, the release of resources, the disadvantage is that each time the need to establish a link, waste of resources,

Interprocess: Pipeline, Message queue, signal, shared memory, socketThere are several ways to communicate between processes:(1) Pipes: Pipelines can be used to communicate between affinity processes, allowing one process and another to communicate with a process that has a common ancestor to it.(2) Named pipe (named pipe): The named pipe overcomes the limitation of the pipe without name, so that, in addition to having the functionality that the pipeline has, it allows for inter-process

4. Roundtrip-based communication protocol design The core of the Communication Server plug-in is three parts: (1) Implementation of communication protocols unrelated to communication methods and business logic; (2) Implementation of communication business logic related to

One, the distinction between communication and communication protocol:1, the traditional meaning of "communication" mainly refers to telephone, telegraph, telex. The "message" of the communication means the messages, and the media messages are passed from one end to the other through the