Add a parallel port and two rs 232 serial ports to your pc through a pci express expansion slot the pex2s1p553b 2s1p pci express serial parallel combo card with breakout cable combines the functionality of parallel and serial cards adding 2 rs232 serial ports and 1 parallel port through a single pci express pcie slot suitable for almost any computer the card offers a low profilehalf height design and includes an optional full height bracket the included break out cable uses a single conn