RS-232, RS-422 and RS-485 standards and application technologies (Part 1)

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RS-232, RS-422 and RS-485 standards and application technologies (Part 1) [Copy link]

At present, interface control technology is often used in the field of radio and television technology to automatically control, remotely control, remotely monitor and remotely diagnose professional equipment. In the early days, it was mainly used in the control of video recorders, mostly using RS-422 or RS-232 interfaces. Since they were used in conjunction with video recorders, the radio and television field did not care much about the details of these interfaces, because this did not affect the normal application of these video recording devices; when it was necessary to realize automatic broadcast control, especially when it was mainly for video recorder control, the interface standards and technical details began to attract the attention of industry developers; now that video servers have been introduced into the field of television broadcasting, the RS-422 interface standards and interface protocols are not only valued by developers, but also by engineering application personnel, because the use of video servers itself means a new type of application, which is not only new for users, but also for developers. At this time, developers and engineering application personnel often have no reference model. Only through the joint efforts of application and development personnel and careful analysis of key technologies can the potential of equipment be fully utilized and novel application methods be constructed. Since RS485 is developed from RS422 , it has the advantage of networking. It is currently mostly used for communication between the control panel and the host of large audio and video matrices. Nowadays, more and more radio and television transmission equipment and code stream processing equipment are equipped with RS232 interfaces for software upgrades and fault diagnosis. Therefore, a deep understanding of the control interface is helpful for radio and television engineering and technical personnel to better develop application systems.