Startech 2-port PCI Express RS232 Serial Adapter Card, PCIe RS232 Serial Host Controller Card, PCIe to Dual Serial DB9 COM Port Card, 16950 UART, Expansion Card, Windows, macOS, Linux
Full/Low-Profile (PEX2S953) | Serial adapter | PCI Express x1 | RS-232 x 2
Main Specification
| Product Description | Startech 2-port PCI Express RS232 Serial Adapter Card, PCIe RS232 Serial Host Controller Card, PCIe to Dual Serial DB9 COM Port Card, 16950 UART, Expansion Card, Windows, macOS, Linux - Full/Low-Profile (PEX2S953) - serial adapter - PCI Express x1 - RS-232 x 2 |
|---|---|
| Device Type | Serial adapter |
| Form Factor | Plug-in card |
| Interface (Bus) Type | PCI Express x1 |
| PCI Specification Revision | PCIe 1.1 |
| Ports | RS-232 x 2 |
| Dimensions (WxDxH) | 7.5 cm |
| Data Link Protocol | RS-232 |
| Data Transfer Rate | 921.6 Kbps |
| Processor | ASIX AX99100 |
| System Requirements | Microsoft Windows Server 2003, Microsoft Windows Server 2008 R2, Microsoft Windows Server 2012, Microsoft Windows Server 2012 R2, Microsoft Windows 7 / 8 / 8.1 / 10, Microsoft Windows Server 2016, Linux 2.4.x - 2.6.x LTS versions only |
| Manufacturer Warranty | Limited lifetime warranty |
General
| Device Type | Serial adapter |
|---|---|
| Form Factor | Plug-in card |
| Interface (Bus) Type | PCI Express x1 |
| PCI Specification Revision | PCIe 1.1 |
Networking
| Ports | RS-232 x 2 |
|---|---|
| Connectivity Technology | Wired |
| Data Link Protocol | RS-232 |
| Data Transfer Rate | 921.6 Kbps |
| Features | Full duplex mode, 256-byte FIFO |
Processor / Memory
| Processor | ASIX AX99100 |
|---|
Expansion / Connectivity
| Interfaces | 2 x RS-232 - 9 pin D-Sub (DB-9) 1 x SATA power - 15 pin Serial ATA power (internal) |
|---|
Miscellaneous
| Included Accessories | 2 x low-profile bracket |
|---|---|
| Compliant Standards | WHQL, FCC, RoHS, WEEE |
Software / System Requirements
| OS Required | Microsoft Windows Server 2003, Microsoft Windows Server 2008 R2, Microsoft Windows Server 2012, Microsoft Windows Server 2012 R2, Microsoft Windows 7 / 8 / 8.1 / 10, Microsoft Windows Server 2016, Linux 2.4.x - 2.6.x LTS versions only |
|---|
Dimensions & Weight
| Depth | 7.5 cm |
|---|
Dimensions & Weight (Shipping)
| Shipping Weight | 146.4 g |
|---|
Manufacturer Warranty
| Service & Support | Limited warranty - lifetime |
|---|
Environmental Parameters
| Min Operating Temperature | -10 °C |
|---|---|
| Max Operating Temperature | 80 °C |
| Humidity Range Operating | 5 - 85% |
Product features
Maximum Compatibility
With broad OS support, including for Windows and Linux, this 2 port PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with a full-profile bracket, and includes optional low-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX2S952 .Experience Optimal Technology
This PCIe to serial adapter supports the following features: • Industry standard 16950 UART compatible • Supports max baud rate of up-to 921.6Kbps • Provides 5/12V power output on Pin 9 when external power is connected • 256-byte depth FIFO cache per transmitter and receiver • Supports 9, 8, 7, 6, 5 data bits (one per port) • Asix AX99100 chipset • Base PCI Express 1.1 compliant • Low and full-profile brackets includedThe Choice of IT Pros Since 1985
StarTech.com conducts thorough compatibility and performance testing on all our products to ensure we are meeting or exceeding industry standards and providing high-quality products to IT Professionals. Our local StarTech.com Technical Advisors have broad product expertise and work directly with our StarTech.com Engineers to provide support for our customers both pre and post-sales. PEX2S953 is backed by a StarTech.com lifetime warranty and free lifetime technical support.Key selling points
- 2 PORT SERIAL CARD: Serial controller card w/16950 UART based on ASIX AX99100, allows 2x DB9 ports w/bi-directional RS232 speeds up to 921.6Kbps per port, available 256 byte FIFO buffer & 9th data bit | Upgraded version of our popular card PEX2S952
- OPTIONAL CONFIGURABLE POWER: PCI Express RS232 Serial Adapter Card provides choice of 12v, 5v, or none through pin 9 w/up to 2A total; Each of the 2 ports are individually configurable
- STANDARD PROFILE & LOW PROFILE BRACKET: PCIe multiport serial card comes w/ a standard bracket pre-installed & 2x low profile brackets incl for versatile install; supports Windows XP and up & Linux
- VERSATILE APPLICATIONS: For standard profile desktop/servers with uses in point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanners, oscilloscope
- STARTECH.COM ADVANTAGE: IT professionals choice for over 30 years; PCI-e RS232 Serial expansion card is backed for life by StarTech.com, incl. free 24/5 North America based multi-lingual tech support
References
MPN: PEX2S953
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04/06/2026 01:21:28