StarTech.com 2 Port PCIe Serial Adapter Card with 16550 – Add 2 RS-232 serial ports to your standard or small form factor computer through a PCI Express expansion slot – pci express serial card – pci-e serial card – pci express RS232 – rs232 card – dual port serial card ADAPTER CARD WITH 16550 UART
The PEX2S553 PCI Express serial card lets you turn a PCI Express slot into 2 RS232 (DB9) serial ports. Based on a native single chip design (no bridge chip), this 2-port serial adapter card allows you to harness the full capability offered by PCI Express (PCIe), and reducing the load applied to the CPU by as much as 48% over conventional serial cards. The RS232 Serial Adapter Card (PEX2S553) is compatible with a broad range of operating systems including Windows® and Linux Kernel 2.6.11 to 4.11.x, and MAC OS 10.4 and above. Plus, the serial card includes an optional half-height/low profile bracket that allows the card to be installed in any PCI Express slot, regard of the size of the computer case. This product is a replacement for our PEX2S552 card. Backed by a StarTech.com 2-year warranty and free lifetime technical support. More from the Manufacturer

Startech PEX2S553

Features

Two high speed RS232 serial ports with support for data transfer rates up to 460.8 Kbps

Compliant with PCI Express base specifications revision 1.0a

Includes half-height/low profile mounting bracket

Selectable power output on pin 9 for the serial port

128-byte deep FIFO per transmitter and receiver

Native single-Chip, single lane PCI Express

Automated out-of-band flow control using CTS/RTS and DSR/DTR

Automated in-band software flow control using programmable Xon/Xoff in both directions

Guides & Documents

Brochure

Manual