The PCI-Express serial interfaces APCIe-7xxx are configured by inserting SI modules which the board identifies automatically. The serial interfaces can be configured through modules in the following modes: RS232, RS422, RS485 (with or without optical isolation) and 20 mA current loop (with optical isolation). The board is especially suited for data acquisition and industrial process control, for direct connection of sensors, for multi-user systems, as PLC interface, for multidrop applications, for modem and printer control, etc.64-bit drivers for Windows 8/7/Vista and drivers for Linux as well as programming samples are included. Real-time drivers for Linux and Windows are available on request.