It is compatible with PCIe GEN2.0 (2.5GT/s) and has 2 ports, each with many enhanced features. Surge protection, optoelectronic isolation protection, DC-DC protection enable it to work normally in more demanding environments, achieve RS485 half duplex and RS422 full duplex control, and achieve bidirectional data transmission with a transmission distance of up to 1.2 kilometers. A single port can support up to 32 devices Simultaneous communication, therefore it is applied in many and situations. The SE-SLV354A-2S PCI-E RS422/RS485 multi port I/O card adopts the high-performance EXAR-17V354 chipset.Compliant with PCI Express version 2.0 PCI Express X1 supports a bus bandwidth of 2.5Gbps;Supports x1,x2,x4,x8,x16 () PCI Express slots RS485 signal:+(A),-(B),GND RS422 signal:+,-,R+,R-,GND Each port supports 600W surge protection and 15KV ESD signal protection RS422/RS485 mode switching can be achieved without jumper settings 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/ 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: 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 Colour:As Shown Material:PCB 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 Due to different batches,there may be differences in product appearance and printed text,which not affect use Package Contents: 1 * Com Port Adapter Card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.