RS-422
lastmod 2026-11-10created 2020-01-142 edits
RS-422 is an electrical standard for serial communication that uses differential signaling. Because data is represented by the voltage difference between two wires, it is more resistant to noise than RS-232 and can transmit over longer distances at higher speeds. It is a unidirectional, multi-receiver arrangement in which a single transmitter sends data to multiple receivers; when bidirectional multidrop is needed, RS-485 is used.