Add 4 rs232 serial ports with 5v or 12v selectable power output to your computer through a pci slot the pci4s954pw 4 port pci serial card with power output turns a pci slot into 4 rs232 db9 serial connections and enables compatible devices to draw power from the serial ports suitable for many rs232 powered serial applications this pci serial card offers a selectable 5v or 12v power option capable of power output using pin 1 4 8 or 9 which enables you to configure the card to suit