RS-422 is a standard for serial communication that allows for the transmission of data over long distances. It uses differential signaling, which means it sends two complementary signals, reducing the effects of noise and allowing for reliable communication. This makes it suitable for applications where data integrity is crucial, such as in industrial automation and telecommunications. Typically, RS-422 can support data rates up to 10 Mbps and distances of up to 4,000 feet (1,200 meters). It can connect multiple devices, allowing for point-to-multipoint configurations, making it versatile for various networking needs.