1It can be widely used in various pin connections for industrial control products using serial communication. 2High quality PCB carrier, all signal ports have been clearly named and marked for easy use. 3With a black shell, it can effectively prevent dust, waterproof splatter and long service life. 4DB9 terminal connector module, without welding, is suitable for field debugging equipment. 5High quality nickel-plated copper needle, durable, in line with RoHS high-quality certification.