InLine Interface Card 4 Port Serial 9 Pin PCIe PCI-Express 76623C

The InLine Interface Card 4 Port Serial 9 Pin PCIe (model 76623C) is a PCI-Express (x1) add-in card that provides four RS-232 serial ports in DB-9 connectors. It complies with PCI-Express Base Specification Revision 1.1 and is designed for installation in two adjacent PCIe slots. The card is compatible with a wide range of operating systems including Windows (2000, XP, Vista, 7, 8 and Server editions), Linux, Mac OS X and DOS, and is based on the Moschip MCS9904CV-AA chipset.

Advantages

This PCIe serial card supports single-lane (x1) PCI-Express operation with throughput up to 2.5 Gb/s and provides four independent RS-232 ports. Each UART is compatible with industrial 16C450/16C550 standards and includes an on-chip 256-byte FIFO for transmit and receive paths to improve data flow. The card supports hardware and software flow control, multiple data formats (5, 6, 7, 8 bits), various parity options (Even, Odd, None, Space, Mark) and 1 or 2 stop bits. A special firmware variant can support higher per-port rates up to 1 Mb/s; standard maximum per-port rate is 230.4 kb/s.

Suitable for

Key specifications

How to use

Install the card into an available PCIe x1 slot (the card occupies two adjacent slot spaces) on a powered-off system and secure it to the chassis. Connect serial devices to the four DB-9 ports using appropriate RS-232 cables. After powering on, install the required drivers for your operating system if they are not provided automatically. Configure port parameters (baud rate, data bits, parity, stop bits, and flow control) in the OS or application to match the connected devices.

Recommendations

For stable communication, match the serial port settings on both ends and enable flow control when connecting devices that require sustained high data rates. Use quality shielded serial cables and avoid long cable runs in electrically noisy environments. Verify driver compatibility for your specific OS version before deployment.