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Designing RS-485 Circuits

From Micro/sys, Inc.

When a network needs to transfer small blocks of information over long distances, RS-485 is often the interface of choice. The network nodes can be PCs, microcontrollers, or any devices capable of asynchronous serial communications. Compared to Ethernet and other network interfaces, RS-485's hardware and protocol requirements are simpler and cheaper. The RS-485 standard is flexible enough to provide a choice of drivers, receivers, and other components depending on the cable length, data rate, number of nodes, and the need to conserve power.
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