Startech com ec1s952 1 port expresscard rs232 serial adapter card 16950 uart startech com ec1s952 p with the ec1s952 1 port native expresscard rs232 serial adaptor card with 16950 uart from startech com you can add an rs232 serial port to your laptop or expresscard equipped desktop computer p p the serial expresscard is based on a single chip architecture as opposed to cards that use a bridge chip providing native pci express communication for greater performance and reliability by