By Schleicher, Blasin
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Extra resources for Digital Interfaces and Bus Systems for Communication - Practical Fundamentals
Sample text
As only a few lines are used in practice, the 9-pin connector is used increasingly nowadays; it has a non-standard pin assignment and was originally introduced by IBM. Fig. bk Seite 30 Dienstag, 6. bk Seite 31 Dienstag, 6. März 2001 3:16 15 1 Basic principles of digital interfaces and networks The signal levels employed are a negative voltage of between –3V and –15V to represent the passive state (high) and a positive voltage of between +3V and +15V to represent the active state (low). The range between –3V and +3V is undefined (see Fig.
Both parallel communication, where data is exchanged over a number of parallel lines, and serial communication are possible. Here, we will consider especially the exchange of data between individual automation components. Normally, this takes place over a serial bus, the fieldbus. In this context, it represents a cost-effective data network for active and passive subscribers at field level, for transmission of distributed input/output information. Because such a bus system has to cope with many different tasks, depending on the application, and in recent years many firms have used their own bus systems, the number of different bus systems has steadily increased.
März 2001 3:16 15 1 Basic principles of digital interfaces and networks Fig. 31: Types of network in local and wide areas MAN The MAN (Metropolitan Area Network) has a range of up to several hundred kilometers and should cope with communication in urban conurbations or towns. Of course, this form of network can also be connected with larger, more comprehensive networks, or even with smaller local subnetworks such as HAN. HAN HAN (Home Area Network) should be used in the home or in the office. Here, various media such as telephone, PC, video and hi-fi system etc.
