This product is an insulating PCI Express bus compatible board that extends the serial communication function compliant with RS-232C on a personal computer.RS-232C-compliant serial port is equipped with 4ch.The noise resistance is enhanced by insulating the bath line between each channel and the PC, and built -in surge protection circuits on the communication port.Each channel, a 128 byte FIFO buffer is installed for sending and reception, and it supports borates up to 921,600bps.Attach a Windows/Linux driver and use it as an OS standard COM port.- [Extended module] Bus specification PCI Express Size Short size Used connector D-SUB 37-pin (female) [Serial communication] Number of channels 4X RS-232C [asynchronous] Transmission speed 2-921,600bps Insulation Insulated Surge Transmission method RS-232C [asynchronous]