RS-422 is a serial communication standard, which allows defining of electrical characteristics of digital circuits. By utilizing the potential difference between the wires (differential transmission), it is possible to achieve data rates up to 10 Mbit/s, and cable length can reach up to 1500 meters. The standard RS-422 defines only signal levels, while other characteristics are prescribed by other standards for serial interfaces. In most applications, RS-422 is used to extend the length of the RS-232 bus.