Supports Quad 16C950 UART Serial Ports over PCI SlotPCI 32-bit, PIO Mode with 133MB/S BandwidthSupports RS-485 Auto Transceiver Turn Around by Unique Featured ATTA?v HardwarePCI IRQ Sharing Feature Eliminates IRQ Conflicts4XDB9-male Connectors with DB37M Octopus Cable4-wire RS-422 and 2-wire RS-485 applicationsSupports 128-Byte Deep FIFOSupports Baud Rate up to 921.6KpbsIsolated and 15KV ESD Surge Protection