| Product Type | PCI Express Serial Adapter Card | 
| Form Factor | Plug-In Card | 
| Chipset | ASIX AX99100 | 
| UART | 16950 UART | 
| FIFO Buffer Size | 256 byte per port | 
| Bracket Type | Standard profile (low-profile bracket included) | 
| Power Output Options (Pin 9) | 5V, 12V or none (up to 2A total) | 
| Max Baud Rate Per Port | 921.6 Kbps | 
| Ports Included | 4 x DB9 RS-232 (via breakout cable) | 
| Operating System Support | Windows, Linux | 
StarTech 4-Port PCIe RS232 Serial Adapter Card - PEX4S953LP
 
 
 
 

Key Benefits
 
            
            
              
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        AI-Powered Summaries from Online Customer Reviews
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- Provides robust RS-232 support for legacy device integration via PCI Express
- Offers flexible deployment with both standard and low-profile brackets plus breakout cable
- Ideal for industrial and commercial environments requiring multi-port serial connectivity
Product Overview
4 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 - Std bracket (low profile incl); Breakout cable - Win/LinuxSpecifications
                      Product Overview
                      
                    
                    
                      Wireless Features
                      
                    
                    
                      Compliance & Origin
                      
                    
                    | TAA Compliant | Yes | 
| Country of Origin | Taiwan | 
| Certifications | CE, FCC, RoHS | 
| Warranty | Lifetime Warranty | 
                      Advanced Security Features
                      
                    
                    
                      Interfaces
                      
                    
                    | Interface Type | PCI Express 1.0a x1 | 
| Port Count | 4 | 
| Connector Type | DB9 (via breakout cable) | 
| Data Transfer Rate | Up to 921.6 Kbps per port | 
| Serial Port Standard | RS-232 | 
| Data Bits | 5, 6, 7, 8, 9 | 
| Stop Bits | 1, 1.5, 2 | 
| Parity | None, Odd, Even, Mark, Space | 
| Flow Control | None, Xon/Xoff, RTS/CTS | 
                      Physical & Environmental
                      
                    
                    | Bracket Height | Standard and Low Profile | 
| Product Height | 18 mm (0.7 in) | 
| Product Length | 120 mm (4.7 in) | 
| Product Width | 90 mm (3.5 in) | 
| Product Weight | 82 g (2.9 oz) | 
| 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 (Operating) | 5% - 95% RH (Non-Condensing) | 
 
               
     
     
     
    