Four serial interfaces are expanded by PCI-Express. The products are designed for POS and ATM applications and are also the first choice for integrators of industrial automation systems. Supports various popular operating systems including Windows and Linux. The 4 RS-232 serial ports support a communication rate of up to 250 Kbit / s and provide modem control signals to ensure compatibility with various serial peripherals. They use the PCI Express x1 bus slot which can be installed in various PCI Express slots (including 4x, 8x, 16x). PCI-Express 1X interface, in line with PCI Express 1.0a standard Support PCI-E 4X / 8X / 16X slot PCI-Express 2.5Gb / s full duplex channel Provide 4-port RS-232 9-pin module Tolerant standard: 16c550 UART standard and 256-byte transmit and receive FIFO 256k Data transmission: up to 115.2Kbps Transmission mode: support RS-232 hardware flow control, full duplex Data bit: 5/6 / 7/8 Parity: none / even / odd / space / mark Stop bit: 1/2 Support Windows / Linux system Transmission interface: PCI-E 1X interface, compatible with PCI-E 3.0 / 2.0 / 1.0 specifications, suitable for PCI-E 4X 8X 16X Number of ports: RS-232 4 ports Support system: Windows 10 / 8.1 / 8/7 / Vista / XP / 2000/2003 (32/64 bit) / DOS Linux kernel 2.6.x