The LCS-6021-485 PCI I/O adapter provides two high performance 16C950-type UART RS-422 andRS-485 serial ports. It is designed for PC, thin client or server to provide instant Combo COM portexpansion via the PCI– or PCI-X Bus. The card is fully Plug-and-Play compatible and no IRQ and I/Oaddresses conflicts. Support RS-485 Auto Transceiver turn around by unique feature ATTATMhardware. For each port you can select individually the transmission output RS-422 or RS-485.