StarTech.com 4 Port PCIe Serial Combo Card

The PEX4S232485 4 Port PCI Express PCIe Serial Combo Card - 2 x RS232 2 x RS422 / RS485 lets you add two RS232, and two RS422/485 serial ports to your PC through a PCI-Express expansion slot.
This PCI express serial card is a single card solution that is compatible with nearly any serial communication protocol, supporting RS-232, RS-422, RS-485 2-wire or RS-485 4-wire operating modes.
A flexible solution for adding serial ports to full-sized, or small form factor systems, the 4-port serial card includes both low and full profile brackets while the included breakout cable helps to avoid cluttered connections.
Backed by a StarTech.com lifetime warranty and free lifetime technical support.

• • 4 port (2 x RS232, 2 x RS422/485) serial combo card
• • RS232 data transfer rates up to 460 Kbps
• • Supports 2-Wire / 4-Wire RS485 modes
• • 256-byte deep FIFO per transmitter and receiver
• • Standard and low-profile bracket included
• • Compliant with PCI-Express specification 1.0a
• • Supports PCI Power Management 1.1