Chapter fifteen
Communication systems
Objectives
The objectives of this chapter are that, after studying it, the reader should be able to:
- Describe centralised, hierarchical and distributed control systems, network configurations and methods of transmitting data and protocols used.
- Describe the Open Systems Interconnection communication model.
- Describe commonly used communication interfaces: RS-232, IEEE 488, 20 mA current loop, I2C bus and CAN.
15.1 Digital communications
An external bus is a set of signal lines that interconnects microprocessors, microcontrollers, computers and programmable logic controllers (PLCs) and also connects them with peripheral equipment. Thus a computer needs to have a bus connecting it with a printer if its ...
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