Add rs232 rs485 and rs422 support to a pc with a single pci add on card the pci2s232485i pci serial adapter card lets you turn a pci or pci x slot into 2 serial ports capable of communicating in rs 232 rs 422 or rs 485this universal all in one adapter not only features two db9 serial ports that can be independently configured but also supports nearly any configuration rs 422 rs 485 2 wire rs 485 4 wire or rs 232 operating modesdesigned for reliability this 2 port pci serial card al