- Processors - Desktops
- Processors - Servers
- Processors - Mobile
- CPU Fans & Heatsinks
- Thermal Compound / Grease
- Water / Liquid Cooling
- DIY Cooling
- Desktop Memory
- Laptop Memory
- Mac Memory
- Server Memory
- System Specific Memory
- Memory Cards
- USB Flash Drives
- AMD Motherboards
- Intel Motherboards
- Embedded Solutions
- Server Motherboards
- Development Boards
- Motherboard Accessories
- Add-On Cards
- CPU Fans & Heatsinks
- Internal Power Cables
- Processors - Desktops
- Processors - Servers
- Processors - Mobile
- CPU Fans & Heatsinks
- Thermal Compound / Grease
- Water / Liquid Cooling
- DIY Cooling
- Desktop Memory
- Laptop Memory
- Mac Memory
- Server Memory
- System Specific Memory
- Memory Cards
- USB Flash Drives
- AMD Motherboards
- Intel Motherboards
- Embedded Solutions
- Server Motherboards
- Development Boards
- Motherboard Accessories
- Add-On Cards
- CPU Fans & Heatsinks
- Internal Power Cables
In Stock
$210.38
Quantity
In Stock
Freight Calculator
- •Brand: Startech
- •Warranty: 7 Year
- •Model: 99X68139
- •Weight: 0.264
The StarTech PEX4S953LP PCIe RS232 Serial Adapter Card allows you to add four RS232 serial ports to your computer, with speeds up to 921.6Kbps. Compatible with both Windows and Linux, this card is ideal for connecting legacy devices in various environments. Backed by a 7-year warranty, this card is a reliable choice for IT professionals and businesses.
Need Help or Found it Cheaper?
Chat with our experts for product advice or price matching on genuine written quotes.
PCI Express to Serial Adapter | 921.6Kbps | Windows and Linux Compatible
This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. The 4 port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps.
Maximum Compatibility
With broad OS support, including for Windows and Linux, this PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with low-profile brackets and includes optional full-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX4S952LP.
Experience Optimal Technology
This PCIe to serial adapter supports the following features:
Compatible with industry-standard 16950 UART
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
PCI Express 1.1 compliant
The 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.
PEX4S03LP is backed by a StarTech.com lifetime warranty and free lifetime technical support.
The StarTech.com Advantage
- Install in home or office workstations
- Connect to automated self-service kiosks or ATM machines
- Connect in retail POS applications
- Connect serial printers and other legacy devices to modern computers
This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. The 4 port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps.
Maximum Compatibility
With broad OS support, including for Windows and Linux, this PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with low-profile brackets and includes optional full-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX4S952LP.
Experience Optimal Technology
This PCIe to serial adapter supports the following features:
Compatible with industry-standard 16950 UART
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
PCI Express 1.1 compliant
The 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.
PEX4S03LP is backed by a StarTech.com lifetime warranty and free lifetime technical support.
The StarTech.com Advantage
- Install in home or office workstations
- Connect to automated self-service kiosks or ATM machines
- Connect in retail POS applications
- Connect serial printers and other legacy devices to modern computers
PCI Express to Serial Adapter | 921.6Kbps | Windows and Linux Compatible
This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. The 4 port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps.
Maximum Compatibility
With broad OS support, including for Windows and Linux, this PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with low-profile brackets and includes optional full-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX4S952LP.
Experience Optimal Technology
This PCIe to serial adapter supports the following features:
Compatible with industry-standard 16950 UART
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
PCI Express 1.1 compliant
The 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.
PEX4S03LP is backed by a StarTech.com lifetime warranty and free lifetime technical support.
The StarTech.com Advantage
- Install in home or office workstations
- Connect to automated self-service kiosks or ATM machines
- Connect in retail POS applications
- Connect serial printers and other legacy devices to modern computers
This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. The 4 port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps.
Maximum Compatibility
With broad OS support, including for Windows and Linux, this PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with low-profile brackets and includes optional full-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX4S952LP.
Experience Optimal Technology
This PCIe to serial adapter supports the following features:
Compatible with industry-standard 16950 UART
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
PCI Express 1.1 compliant
The 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.
PEX4S03LP is backed by a StarTech.com lifetime warranty and free lifetime technical support.
The StarTech.com Advantage
- Install in home or office workstations
- Connect to automated self-service kiosks or ATM machines
- Connect in retail POS applications
- Connect serial printers and other legacy devices to modern computers
PCI Express to Serial Adapter | 921.6Kbps | Windows and Linux Compatible
This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. The 4 port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps.
Maximum Compatibility
With broad OS support, including for Windows and Linux, this PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with low-profile brackets and includes optional full-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX4S952LP.
Experience Optimal Technology
This PCIe to serial adapter supports the following features:
Compatible with industry-standard 16950 UART
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
PCI Express 1.1 compliant
The 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.
PEX4S03LP is backed by a StarTech.com lifetime warranty and free lifetime technical support.
The StarTech.com Advantage
- Install in home or office workstations
- Connect to automated self-service kiosks or ATM machines
- Connect in retail POS applications
- Connect serial printers and other legacy devices to modern computers
This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. The 4 port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps.
Maximum Compatibility
With broad OS support, including for Windows and Linux, this PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with low-profile brackets and includes optional full-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX4S952LP.
Experience Optimal Technology
This PCIe to serial adapter supports the following features:
Compatible with industry-standard 16950 UART
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
PCI Express 1.1 compliant
The 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.
PEX4S03LP is backed by a StarTech.com lifetime warranty and free lifetime technical support.
The StarTech.com Advantage
- Install in home or office workstations
- Connect to automated self-service kiosks or ATM machines
- Connect in retail POS applications
- Connect serial printers and other legacy devices to modern computers
Zotim is a trading name of Zcompute Pty Ltd (ABN 94 613 746 535) — © 2026 Zcompute Pty Ltd. All rights reserved.
