Features: Brand new and high quality PCI MCS9865 2S industrial expansion card can provide two high-speed serial interfaces for computers, which is convenient for connecting various external devices. It has high performances and stability, supports various operating system, is suitable for industrial environment, has anti-interference ability and can run stably for a long time. Professionals who need to use serial interfaces, such as technicians in industrial field, electronic engineers and computer maintenance personnel. Can be widely used in industrial automation control, communication equipment, instrumentations, security monitoring and other fields to meet the needs of different industries. Its anti interference capabilities ensure stable operation even in challenging environments. Specifications: Material:PCB Connection port: DB9 Working mode: asynchronous working, point-to-point or point-to-many, full-duplex 4-wire, half-duplex 2-wire. Communication signal: RS422 signal: T/R+,T/R-, RXD+,RXD, GND. RS485 signal: T/R+,T/R, GND. Transmission medium: twisted pair or shielded wire. Transmission rate: 38400bps at 600M and 9600bps at 1.2KM. Signal rate: 75-128000bps (automatic detection) Load capacity: each converter is allowed to connect 32 RS422&RS485 or more devices. Operating environment: -25-70 and relative humidity 5%-95% Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x PCI MCS9865 RS485&RS422 conversion card 2x DB9 to 6PIN connector 1x CDdriver 1x Neutral box