I am trying to pick pull up and pull down resistors for the RS-485, SN65HVD72. I am connecting the RS-485 to devices ranging from 8 feet of wire to 100 feet of wire. According to this document, using ...

RS485 is a most used wired communication for industrial purposes. In many cases we need a solution to isolated or internal circuit from RS bus. To this aim I put a simple and cheep circuit using ...

Since RS485 uses differential voltages it is not necessary to include a common ground between each of the devices. Only the two wires A and B are required. Several resources include wiring diagrams ...