Control and communicate with two serial devices even with mixed rs 232 485 protocols 2 port rs232 422 485 pci serial adapter card with esd protection two port serial card serial adapter card pci serial card supports rs232 rs422 or rs485 2 wire and rs485 4 wire modes makes it easy to communicate with two different serial modes from the same pci card supports baud rates up to 921 6 kbps built in esd protection to ensure that your connected serial devices remain protected