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).
![Choice of systems](https://img-lib.wm-help.net/898219817/i_172.png)
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).
![Choice of systems](https://img-lib.wm-help.net/898219817/i_173.png)
Figure 17.12 Around the building
Unlimited range
Add a modem and link by telephone or optic fibre (see Figure 17.13).
![Choice of systems](https://img-lib.wm-help.net/898219817/i_174.png)
Figure 17.13 Around the world
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