What is rs 485 pinout?

RS-485, also known as EIA-485, is a standard for serial communication transmission of data over long distances up to 4000 feet. The RS-485 standard specifies a differential balanced transmission line with two signals, A and B, each having the same voltage magnitude but opposite polarity. RS-485 is commonly used in industrial and automation systems which require reliable data communication between devices.

The RS-485 pinout describes the physical connection of the RS-485 wire and which signal performs which function. The RS-485 interface typically uses a 9-pin or a 25-pin D-sub connector with a male or female gender. In a standard 9-pin RS-485 pinout, pin 1 is used for ground, and pin 2 and pin 3 represent the differential signals A and B, respectively.

Here is a list of the RS-485 pinout for the 9-pin and 25-pin connectors:

9-pin RS-485 Pinout Pin 1: Ground Pin 2: Data A (+) Pin 3: Data B (-) Pin 4: Not connected Pin 5: Not connected Pin 6: Not connected Pin 7: Not connected Pin 8: Not connected Pin 9: Not connected

25-pin RS-485 Pinout Pin 1: Chassis Ground Pin 2: Data A (+) Pin 3: Data B (-) Pin 4: Reserved Pin 5: Signal Ground Pin 6: Not connected Pin 7: Not connected Pin 8: Not connected Pin 9: Not connected Pin 10: Not connected Pin 11: Not connected Pin 12: Not connected Pin 13: Not connected Pin 14: Not connected Pin 15: Not connected Pin 16: Not connected Pin 17: Not connected Pin 18: Not connected Pin 19: Not connected Pin 20: Not connected Pin 21: Not connected Pin 22: Not connected Pin 23: Not connected Pin 24: Not connected Pin 25: Not connected

It is important to note that the pinout may differ depending on the manufacturer or device being used, and it is essential to refer to the datasheet of the product for the correct pinout information.