Adding to the existing line of industrial interface cards for ISA and PCI bus systems, Wiesemann & Theis has developed a family of serial PCI Express cards. The compact interface cards for x1 PCI Express slots feature two galvanically isolated serial high-speed ports and are plug- and function-compatible with the still available ISA and PCI boards. The cards are available with two selectable RS232/RS485/RS422 ports or with two 20mA ports. The modular design, however, also allows mixed use of the ports, so that the still uncommon PCI Express slots can be optimally used. In RS485/422 mode the cards handle up to 3MBaud, while rates of up to 1MBaud are possible in RS232 mode.