StarTech.com 4 Port PCI Express Dual Profile PCIe Serial Card Adapter with Breakout Cable - 2 x RS232 2 x RS422/RS485 PEX4S232485
[Product Information]
Form Factor: plug-in card
Interface (bus) Type: PCI Express x1
Dimensions (WxDxH): 0.8 in x 2.8 in x 4.9 in
This single PCI Express combo card is compatible with any serial device protocol (RS232, RS422, and RS485), allowing for communication with multiple devices over mixed protocols
Includes both low profile/half-height and full profile brackets to ensure fitment into a broad range of system form factors
The included breakout cable saves expense as an all-in-one solution, and allows the addition of multiple serial ports through a single PCI Express slot
4 port (2 x RS232, 2 x RS422/485) serial combo card