The pci2s4851050 2 port pci serial adapter card rs422rs485 with 161050 uart adds two db9 rs422rs485 serial ports using a single pci expansion slot the pci serial card offers a high performance 16c1050 uart and supports both 2 wire and 4 wire rs485 modes the card delivers an efficient single chip design and a large 256 byte transitreceive fifo buffer that work together to provide high speed serial communication while reducing the overall load on the system cpu with the included sta