| Product Type | PCIe RS232 Serial Adapter Card |
| Form Factor | Low Profile (Standard Bracket Included) |
| Chipset | ASIX AX99100 |
| UART Type | 16950 |
| FIFO Buffer | 256-byte |
| Data Bit Support | 5, 6, 7, 8, 9 |
| Flow Control | Software (XON/XOFF), Hardware RTS/CTS |
| Power Output on Pin 9 | 5V, 12V or none (Selectable via Jumper) |
| Power Output Capacity | Up to 2A total |
| Max Baud Rate | 921.6 Kbps |
| Connectivity Technology | Wired |
| Bracket Types Included | Low-profile and full-height |
StarTech PCIe RS232 Serial Adapter Card with 16950 UART (PEX1S953LP)

Key Benefits
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AI-Powered Summaries from Online Customer Reviews
Eye-Insights™ are generated by proprietary AI that analyzes real online customer reviews to highlight top pros and key product features. While we aim for accuracy, insights are provided “as-is” and individual results may vary.
- - Ensures industrial-grade reliability and signal integrity with 16950 UART and ASIX AX99100 chipsets
- - Versatile deployment thanks to TAA compliance and dual bracket options for various system types
- - Long-term value supported by lifetime warranty and broad OS support (Windows/Linux)
Product Overview
1 port PCI Express RS232 serial controller card w/16950 UART/ASIX AX99100 - Bi-directional speeds 921.6Kbps/port / 256 byte FIFO / 9th data bit - Pin 9 pwr out 5v/12v/none w/up to 2A total - Expansion card w/low profile (Std bracket incl) - Win/LinuxSpecifications
Product Overview
Physical & Environmental
| Width | 5.9 in (14.99 cm) |
| Depth | 3.9 in (9.91 cm) |
| Height | 2.6 in (6.6 cm) |
| Weight | 60 g (2.12 oz) |
| Housing Material | Steel |
| LED Indicators | TX/RX Activity |
| Operating Temperature | 0°C to 50°C (32°F to 122°F) |
| Storage Temperature | -20°C to 70°C (-4°F to 158°F) |
| Humidity Tolerance | 5% - 95% RH (non-condensing) |
| Product Color | Green |
Cloud Management & Licensing
| Management Interface | |
| Licensing Requirements | |
| Bundled Software | Drivers for Windows and Linux |
Package Information
| Included Accessories | Low-profile bracket, user manual, driver CD |
| Package Weight | 0.24 lb (0.11 kg) |
| Package Dimensions (L x W x H) | 6.7 x 5.6 x 1.2 in |
| UPC | 065030881159 |
Interfaces
| Host Interface | PCI Express x1 |
| Serial Ports | 1 x RS-232 (DB9) |
| Interface Type | RS-232 Serial Port |
| Connector Type | DB-9 Male |
Compliance & Origin
| Country of Origin | Taiwan |
| TAA Compliant | Yes |
| RoHS Compliant | Yes |
| Environmental Standards | WEEE, REACH |
| Certifications | CE, FCC |
Advanced Security Features
| ESD Protection | 15kV Air and Contact Protection |