It is compatible with PCIe GEN2.0 (2.5GT/s) and has 2 ports, each with many enhanced features. Half duplex, RS-422 full duplex control, can achieve bidirectional data transmission with a transmission distance of up to 1.2 kilometers, and a single port can support up to 32 more Surge protection, photoelectric isolation protection, DC-DC protection enable it to operate normally in more demanding environments and achieve RS-485 The device communicates simultaneously, so it is applied in many and various situations. Compliant with PCI Express version 2.0;PCI Express X1 Lane supports a bus bandwidth of 2.5Gbps;Supports x1, x2, x4, x8, x16 (lane) PCI Express slots RS485 signal:T+(A),T-(B),GND RS422 signal:T+,T-,R+,R-,GND Each port supports 600W surge protection and 15KV ESD signal protection RS422/RS485 mode switching can be achieved without jumper settings operation mode:RS422:Asynchronous work, point-to-point, point to multipoint full duplex communication mode; RS485:Point to point, point to multipoint half duplex communication mode Transmission distance:RS485/RS422 mode 1200 meters (9600bps) Transmission medium:twisted pair or shielded wire Interface protection:600W surge protection, 15KV ESD full signal protection, 2500V magnetic coupling isolation protection, Transient common mode rejection capability:25KV/μ s, 1000V DC-DC power isolation protection UART supports 5, 6, 7, 8 data bits, 1, 1.5, 2 stop bits Parity check:even, odd, none, flag, space Flow control:None, hardware and Xon/Xoff Load capacity:Supports point to multipoint transmission, with each conversion port supporting up to 32 RS485/RS422 devices Working temperature:- 40 - 85℃ System requirements:Windows 2000/XP/Server2003/Vista/Win 7/Win 8/Win 8.1 /Win 10, 32 or 64bit Linux2.6.27,2.6.31,2.6.32,3.x.x Higher