• Add 4 RS-232 serial ports to your standard or small form factor computer through a PCI Express Expansion Slot.
• 4 Port PCIe Serial Card.
• 4 Port RS232 Card.
• 4 Port Serial Adapter.
• 4 Port PCI Express Serial Card.
• Native single-chip, single lane PCI Express chipset delivers true PCIe performance, up to 48% more efficient than bridge chip designs.
• Standard and low profile/half-height brackets included to ensure fitment in any system.
• Four high speed RS232 serial ports, with support for data transfer rates up to 128000bps.
• 256-byte deep FIFO per transmitter and receiver.
• Native single-Chip, single lane PCI Express.
• Includes half-height/low profile ing brackets.
• Built-in 16C450/550 compatible UART.
• Compliant with PCI Express Base Specification 1.1.

Four high speed RS232 serial ports, with support for data transfer rates up to 128000bps 256-byte deep FIFO per transmitter and receiver Native single-Chip, single lane PCI Express Includes half-height/low profile ing brackets Built-in 16C450/550 compatible UART Compliant with PCI Express Base Specification 1.1 The PEX4S553 4-Port Native PCI Express RS232 Serial Adapter Card with 16550 UART lets you add 4 RS232 (DB9) serial ports, using a single PCI Express expansion slot. Based on a native single-chip design, this 4-port serial adapter card allows you to harness the full capability offered by PCI Express (PCIe), while reducing the load applied to the CPU by as much as 48% over conventional bridge-chip serial cards. The RS232 Serial Adapter Card includes 4 half-height/low-profile brackets, allowing the card to be installed into almost any PC case, regardless of form factor. Backed by a StarTech.com Lifetime warranty and free lifetime technical support. POS retail applications in grocery stores, and any other retail store to control keyboards, cash drawers, receipt printers, card readers / card swipes, scales, and elevated displays on poles Bank teller workstations in either full profile or low profile versions to control their serial devices such as cash drawers, card readers / card swipes, printers, keypads / pinpads, pen pads Self-service automated machines and kiosks to control serial devices such as scales, touchscreens, magnetic card readers, bar code scanners, receipt printers, label printers Standard ATM automated teller machines to control keypads, receipt printer, card readers / card swipes, touchscreen LCD's, camera control, etc. Used to control multiple surveillance / security cameras in a parking structure, office building, etc. Native single-chip, single lane PCI Express chipset delivers true PCIe performance, up to 48% more efficient than bridge chip designs Standard and low profile/half-height brackets included to ensure fitment in any system Specifications Warranty Information Warranty Lifetime Connector(s) 1 - Connector Type(s) PCI Express x1 4 - External Ports DB-9 (9 pin, D-Sub) Environmental Operating Temperature 0°C to 50°C (32°F to 122°F) Storage Temperature -20°C to 60°C (4°F to 140°F) Humidity 5~85% RH Hardware Ports 4 Interface Serial Bus Type PCI Express Card Type Standard Profile (LP bracket incl.) Port Style Integrated on Card Chipset ID ASIX - MCS9904CV-AA Packaging Information Package Height 1.2 in [30 mm] Package Length 6.7 in [17 cm] Shipping (Package) Weight 8.1 oz [230 g] Package Width 5.6 in [14.1 cm] Performance Serial Protocol RS-232 Max Baud Rate 128 Kbps Data Bits 5, 6, 7, 8 FIFO 256 bytes Parity 5, 6, 7, 8 MTBF 26,280 Hours Physical Characteristics Weight of Product 2.6 oz [74 g] Color Green Material Steel Product Length 4.7 in [12 cm] Product Width 5.1 in [13 cm] Product Height 0.7 in [1.9 cm] Software OS Compatibility Windows® DOS, 95, 98SE, 2000, CE 5.0/6.0, Embedded System 2009, POS Ready 2009, XP Embedded, XP, Vista, 7, 8, 8.1, 10, 11 Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016, 2019 Mac OS® 10.4 to 10.10 Linux 3.5.x to 4.11.x LTS Versions Only Microsoft WHQL Certified Yes What's in the Box 1 - Included in Package 4 Port PCI-Express RS-232 Serial Card Bracket with 2 DB9 male ports Driver CD Instruction Manual 4 - Included in Package Low Profile Brackets