4 Port RS-232 RS-485 DB9 Serial PCI-e 2.0 x1 Card

Exar Chipset: XR17V358 PCIe 2.0 Gen 1 compliant x1 Link, dual simplex, 2.5Gbps in each direction Supports x1, x2, x4, x8, x16 PCIe Bus connector keys RS485 signals:DATA+ (B) ?DATA- (A) ?GND RS422 signals: ?T/R+ ?T/R- ?RXD+ ?RXD- ?GND 600W surge protection, 15KV ESD protection for serial ports The XR17V352 series Multi-I/O PCI-Express controller cards are the high performance RS-232 serial interface controller for home and industrial users. They are compatible with industrial standard 16C550 UART, which provide a low cost connection platform for industrial machines, POS machines, external modems, mice, etc.