Key Details:
- Model: PEX4S553B
 - Part #: T45254
 - Warranty: Supported by Manufacturer
 - Brand: StarTech
 
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StarTech 4 Port Native RS232 Serial PCI Express Adapter Card with Breakout Cable
The PEX4S553B 4-Port PCI Express Serial Card (with breakout cable) lets you add 4 RS232 serial ports using a single PCIe expansion slot, with an included 1-to-4 cable enabling you to add 4 serial ports to a single low profile slot. The serial card features a native single-chip design that provides optimum reliability and speed, reducing the CPU load by up to 48% over conventional bridge-chip serial cards - a cost-effective solution for connecting legacy serial devices to PCIe-enabled computers.
- Native single chip design
 - Includes a full profile and low profile/half-height bracket
 - On chip 256-byte depth FIFO in transmit/receive path of each port
 
Hardware:
- Bus Type: PCI Express
 - Card Type: Low Profile (SP bracket incl.)
 - Chipset ID: ASIX Moschip MCS9904CV-AA
 - Interface: Serial
 - Port Style: Dongle (Included)
 - Ports: 4
 
Performance:
- Data Bits: 5, 6, 7, 8
 - FIFO: 256 Bytes
 - Max Baud Rate: 230.4 Kbps
 - Parity: Even, Odd, None, Space and Mark
 - Serial Protocol: RS-232
 
Connector(s):
- Connector Type(s): 1 - PCI Express x1 Male
 - External Ports: 4 - DB-9 (9 pin, D-Sub) Male
 
- Microsoft WHQL Certified: Yes
 - 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, 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
 
- 1x 4 Port PCI-Express Serial Card
 - 1x Breakout cable
 - 1x Full profile bracket
 - 1x Driver CD
 - 1x Instruction Manual
 
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