Add a usb based rs232 serial port to your laptop through an expresscard slot the ec1s232u2 expresscard rs232 serial adapter card usb based 16950 uart adds an rs232 db9 serial port to your expresscard equipped laptop enabling you to connect an rs232 serial peripheral device such as a plotter digital signage device receipt printer or bar code scanner through an available expresscard slot this usb based expresscard supports rs232 serial data transfer rates up to 460 kbps and eliminate