Brainboxes - VX-001 1 Port RS-232 Serial Express Card - 1 x 9-pin DB-9 Male RS-232 Serial BRAINBOXES VX-001-001 1PORT EXPRESSCARD RS232. ExpressCard providing one RS232 serial port. ExpressCard is 34mm wide and fits 34mm or 54mm slots. Data transfer rates up to 921,600 baud rates and the 128 byte deep transmit and 256 byte receive FIFOS 1Mbit/s line drivers deliver uncompromising performance on your laptop. Drivers for Windows 32 bit and 64 bit Operating Systems including Windows XP, Server 2003, Vista, Server 2008, Windows 7 and Windows 8