Книга: Introduction to Microprocessors and Microcontrollers
Choice of systems
Choice of systems
A few metres
We can use the raw binary data transmitted over a simple cable (see Figure 17.11).
Figure 17.11 A very short range link up
Tens or hundreds of metres
We can convert the transmitted signal to RS232C or RS423A as necessary (see Figure 17.12).
Figure 17.12 Around the building
Unlimited range
Add a modem and link by telephone or optic fibre (see Figure 17.13).
Figure 17.13 Around the world
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