What Does a Terminal Operator Do?
Remote control terminals are some users distributed in a wide geographical environment. It is connected to the central control machine through a communication channel. As far as the meaning of "terminal" is concerned, it is a general term for many different types of input-output devices, such as printers, CRT display devices, keyboards, and so on.
Remote terminal
Right!
- Chinese name
- Remote terminal
- Terminal type
- Five categories
- the way
- Connect with the central control unit through the communication channel
- Main body
- Some users in a wide geographic environment
- Application
- Printer, CRT display device, keyboard
- Remote control terminals are some users distributed in a wide geographical environment. It is connected to the central control machine through a communication channel. As far as the meaning of "terminal" is concerned, it is a general term for many different types of input-output devices, such as printers, CRT display devices, keyboards, and so on.
- Remote terminal type
- For the application of remote control systems, the so-called terminals can be divided into five categories according to the different applications: [1]
- 1. Data acquisition terminal
- It is a sensor type terminal, which usually includes halo interface equipment, A / D (Analog / Digital) converter, storage buffer, reference clock, communication multiplexer and modem. This type is mainly It belongs to the type of automatic data collection.
- 2. Control terminal
- It has the opposite function to the data acquisition terminal and is mainly used to reflect the decision of the system. These terminals include instrument interface equipment, D / A (digital / analog) converters, storage buffers, demultiplexers for communication and tree modulators. When the operation of the system must change its control path in real time, it is used to feedback the processing of this system.
- 3 Data transaction terminal
- Its function is equivalent to the joint function of the data acquisition terminal and the control terminal, but it is also different. The data collection terminal belongs to the automatic collection of data when the input conditions change, and as a data transaction processing terminal, after data collection, a person replaces the automatically collected device for data insertion. This requires another device that can be programmed by people Computer, people can send the collected data into the machine through the standard keyboard, and then send it to the central control machine through the communication channel after format processing, waiting to receive the processing result of the central control machine. This is equivalent to the remote user terminal of the central control machine. Try to consider entering complex information with convenient operations as much as possible in the design.
- 4. Data inquiry terminal
- It is widely used, especially when the central control computer uses a computer time-sharing system, the terminal operator can ask the central control machine for information in a fixed format, and the central control machine can also instruct it through the terminal.
- As an inquiry terminal, it is necessary to have input and output devices, so that the operator can use one terminal to send and receive information. Furthermore, these terminals should be able to provide the operator with a copy of his questions and computer answers, or give a hard copy in print, or a graphical display. Currently more advanced interrogation terminals should include CRT monitors and keyboards, which can only provide soft copies to operators. Through this terminal, the dispatcher can intuitively and concise information content and computer response.
- 5. Display terminal
- This is a simple output device, and the data it displays is a direct indication of the decisions made by the control center. In fact, it can also be divided into two types. One is a display terminal suitable for personal use. The general CRT monitor and keyboard as described above are sufficient. The other is a large screen display, which can give online analysis and diagrams of related problems. However, its design is more complicated, and more detailed research is needed on driving methods and driving sources.