Control and communicate with two serial devices even with mixed rs 232 485 protocols 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 485 operating modes at baud rates up to 9216 kbps this universal serial adapter not only features two db9 serial ports that can be independently configured but also supports nearly any configuration including rs 422 rs 485 2 wire rs 485 4 wire or rs 232 mo