The M12 connector, named for its 12mm diameter, is a circular, threaded connector commonly used in industrial applications. Initially developed for sensor and actuator connections, it has evolved to support various data transmission needs, including Ethernet, Profibus, DeviceNet, and more. This guide explains pin coding, color standards, and practical wiring logic for communication and sensor-level integr. What Are M12 Ethernet Cables? M12 Ethernet cables utilize the M12 circular. Antaira offers Ethernet M12 gigabit Ethernet connectors that are X-coded and A-coded with PoE options. Some of our industrial M12 Ethernet switches have a rugged IP67 rated metal case design to eliminate downtime when around dust and water.