Load capacity:supports point-to-multipoint transmission, each conversion port supports up to 32 RS485/RS422 devices SE-SLV352A-2S PCI-E RS422/RS485 multi-port I/O card uses the high-performance -17V352 chip It is compatible with PCIe GEN2.0 (2.5GT/S), and it has 2 ports, each port has many enhanced features. For example: 256- TX and RX first-in-first-out, programmable baud rate generator, automatic hardware or software flow control, and it comes with Surge protection, photoelectric isolation protection, DC-DC protection enable it to work normally in more harsh environments, and can achieve RS485 half-duplex and RS422 full-duplex control. It can also realize two-way data transmission with a transmission distance of up to 1.2 kilometers, and a single port can support up to 32 devices. Simultaneous communication, so it is used in many occasions Way of working: RS422:asynchronous work, point-to-point, point-to-multipoint full-duplex communication mode RS485:point-to-point, point-to-multipoint half-duplex communication mode PCI Express X1 supports 2.5Gbps bus bandwidth Support x1,x2,x4,x8,x16()PCI Express slot 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 suppression capability:25KV/s, 1000V DC-DC power isolation protection UART supports 5, 6, 7, 8 data bits, 1, 1.5, 2 stop bits Parity:Even, Odd, None, Flag, Space Flow control:None, hardware andXon/Xoff Working temperature:-40-85 Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:PCB+Plastic Package Contents: 1 * PCI Express RS422/RS485 Multi-Function I/O Card 1 * Cd Driver 1 * DB9Pin To 5Pin Converter 1 * 44Pin To 9Pin Serial Cable 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.