Although the RS-485 bus has various problems, however, due to its simple circuit design, low price and convenient to control, it is still popular applied in some applications as long as it is used reasonably and appropriately:

The below PDF has contents of the following topics and you are welcome to download for reference:

1. Introduction to RS485 bus

2. Introduction to typical circuit of RS485 bus

3. Introduction to typical circuit of isolated RS485 bus

4. RS485 bus protection circuit

Click to download: RS485-application circuit diagram v2.0 (Chinese version)