Need reliable legacy serial connectivity for an industrial computer? A well-matched PCIe serial card can keep barcode scanners, PLCs, sensors, and test equipment talking to your system without slowing operations.
Below, we focus on cards that balance port count, signal support, driver compatibility, and physical fit so you can choose with confidence for 2026.
Best 10 Pcie Serial Card for Industrial PC Picks for 2026
Best for Multi-Mode Devices
StarTech 2-Port PCIe Serial Card
- Independent RS-232/RS-422/RS-485 modes per port
- Supports auxiliary pin 9 power for select devices
- Includes standard and low-profile brackets
Best For: Industrial PCs and SFF systems with mixed legacy serial equipment.
Best for Industrial Protection
Industrial 4-Port PCI-E RS485/422 Serial Card
- Optical isolation and surge protection for tough environments
- Four RS-485/RS-422 ports for multi-device expansion
- Broad Windows, Linux, and embedded OS compatibility
Best For: Factory automation and industrial PCs needing protected multi-port serial expansion.
Best for Legacy Systems
- Adds 2 RS-232 DB9 ports via PCIe x1
- Works with Windows XP through 11 and Linux
- Includes standard and low-profile brackets
Best For: Industrial PCs and desktops connecting legacy DB9 serial devices.
Best for Mixed Serial + Parallel Legacy Devices
PCIe Combo Serial Parallel Card
- Adds both serial and parallel ports on one PCIe x1 card
- Supports RS232, RS485, RS422, and IEEE 1284 parallel modes
- Low-bracket design suits compact industrial or desktop cases
Best For: Industrial and legacy PCs that need both COM and LPT connectivity in one card.
Best for Legacy Device Support
- 2 RS-232 DB9 ports via PCIe x1
- Windows XP through 11 and Linux support
- Includes full-size and low-profile brackets
Best For: Industrial PCs and legacy device setups that need dependable DB9 serial connectivity.
Best for Mixed OS Industrial Installations
StarTech 2-Port PCIe RS232 Card
- Two RS232 ports with 16950 UART performance
- Low-profile and full-height brackets included
- Windows and Linux support for legacy gear
Best For: Industrial PCs needing dependable dual RS232 connectivity across Windows or Linux.
Best for Legacy RS-232 Expansion
PCIE-SE2 2-Port PCIe RS-232 Card
- Adds 2 RS-232 DB9 ports from one PCIe slot.
- Includes full-size and low-profile brackets.
- Works with Windows and Linux systems.
Best For: Industrial PCs and desktop systems that need dependable dual RS-232 connectivity.
Best for Legacy RS-232 Connectivity
StarTech 2-Port PCIe Serial Card
- Dual RS-232 DB9 ports for legacy devices
- Low-profile and full-height brackets included
- Windows/Linux support with COM retention
Best For: Industrial and lab systems that need dependable RS-232 connectivity for older peripherals.
Best for Legacy COM Devices
2-Port PCIe Serial Card with DB9 RS232
- Two DB9 RS232 ports for legacy industrial devices
- 16C550 UART and WCH382 chipset support
- Includes low bracket for compact PC cases
Best For: Industrial PCs and workstations needing two reliable RS232 COM ports for older equipment.
Best for Legacy Industrial Devices
StarTech 1-Port PCIe RS232 Card
- 16C1050 UART with 256-byte FIFO
- Includes standard and low-profile brackets
- COM retention plus screw-lock DB9 support
Best For: Industrial PCs and SFF systems that need dependable RS232 connectivity for legacy equipment.
Best for Multi-Mode Devices – StarTech 2-Port PCIe Serial Card
If you need a pcie serial card for industrial pc setups that still depend on legacy DB9 gear, this StarTech card is a practical fit. Each port can be set independently for RS-232, RS-422, or RS-485, so one card can cover mixed equipment without adding extra adapters.
Best For: Industrial PCs, SFF systems, and desktops that need flexible serial connectivity for PLCs, scanners, sensors, and control equipment.
Pros:
- Independent per-port mode selection for RS-232, RS-422, and RS-485
- Auxiliary power options on pin 9 for compatible devices
- Includes standard and low-profile brackets for broader case support
- LED activity indicators help with quick port status checks
Cons:
- Requires PCIe expansion and internal setup, so it is not plug-and-play
- Pin 9 power depends on jumper and SATA power configuration
For buyers who want a flexible, TAA-compliant pcie serial card for industrial pc deployments, this model stands out for mode switching and device compatibility rather than raw port count. It is a sensible choice when keeping older serial equipment online matters more than chasing a basic low-cost add-in card.
Best for Industrial Protection – Industrial 4-Port PCI-E RS485/422 Serial Card
If you need a pcie serial card for industrial pc use, this 4-port RS-485/RS-422 adapter is built around durability first. It adds isolated multi-serial expansion, supports long-distance transmission, and includes surge, ESD, and lightning protection for harsher electrical environments.
Best For: Factory controllers, automation systems, and industrial PCs that need isolated RS-422/485 expansion with robust protection.
Pros:
- Optical isolation plus TVS protection helps guard connected equipment
- 4 ports give flexible expansion for multi-device industrial setups
- Wide OS support covers Windows, Linux, VxWorks, and embedded systems
Cons:
- RS-422/485 only, so it is not a general-purpose COM card
- Driver/setup support may take extra effort on older or niche systems
Overall, this is a practical pcie serial card for industrial pc deployments where electrical noise, long cable runs, and port protection matter more than consumer-friendly extras. It is a strong fit when you need dependable serial connectivity across multiple devices.
Best for Legacy Systems – 2-Port PCIe RS-232 DB9 Card
If you need a pcie serial card for industrial pc use, this 2-port RS-232 add-in card is a practical way to connect legacy equipment through a modern PCIe slot. It’s aimed at business and industrial setups that still rely on DB9 devices like POS terminals, scanners, printers, control gear, and security hardware, with broad OS support for older and newer systems.
Best For: Industrial PCs and desktop systems that need reliable RS-232 ports for legacy peripherals, especially in mixed Windows and Linux environments.
Pros:
- Adds two RS-232 DB9 ports from a single PCIe x1 slot
- Wide compatibility with Windows XP through 11 and Linux kernels 2.6.x to 5.x
- ASIX AX99100 chipset with 256-byte FIFO for stable serial transfers
- Includes full-size and low-profile brackets for different case types
Cons:
- Requires an open PCIe slot and driver installation
- Only supports RS-232 devices, not RS-422 or RS-485
- Mini-CD driver setup may be inconvenient on systems without an optical drive
For buyers who need a straightforward pcie serial card for industrial pc deployments, this model stands out for broad OS support and flexible bracket options rather than advanced serial features.
Best for Mixed Serial + Parallel Legacy Devices – PCIe Combo Serial Parallel Card
If you need a practical pcie serial card for industrial pc setups that still rely on older equipment, this PCIe combo board gives you both serial and parallel expansion in one low-profile package. It supports RS232, RS485, and RS422 modes plus IEEE 1284 parallel printing, making it a flexible fit for machines, lab gear, and legacy peripherals.
Best For: Industrial and legacy system users who want one PCIe card to add serial ports and an LPT printer connection.
Pros:
- Combines serial and parallel expansion on a single PCIe x1 card
- Supports RS232, RS485, and RS422 for broader device compatibility
- IEEE 1284 parallel mode covers SPP, PS2, EPP, and ECP
- Low-bracket design is helpful for compact desktops and industrial cases
Cons:
- Driver installation may require manual setup from the included CD
- Not ideal if you only need one port type instead of both
- Compatibility depends on your PC’s PCIe slot and OS support
For older production hardware, test rigs, and office systems that still need printer or machine-control connectivity, this pcie serial card for industrial pc use case is appealing because it consolidates multiple legacy interfaces without taking up much space.
Best for Legacy Device Support – 2-Port PCIe RS-232 DB9 Card
If you need a reliable pcie serial card for industrial pc setups, this 2-port RS-232 DB9 adapter is a practical way to add legacy serial connections through a PCIe x1 slot. It’s a strong fit for older equipment, mixed Windows/Linux environments, and systems that still depend on stable DB9 communication.
Best For: Industrial PCs, POS terminals, test equipment, and other setups that need two dependable RS-232 ports with broad OS support.
Pros:
- Adds two RS-232 DB9 ports through a standard PCIe x1 interface
- Broad compatibility with Windows XP through 11 and Linux kernels 2.6.x to 5.x
- ASIX AX99100 chipset with 256-byte FIFO for stable data transfer
- Includes full-size and low-profile brackets for desktop or slim cases
Cons:
- Requires an open PCIe slot and correct driver installation
- Not a fit for users who need USB-based serial expansion
For buyers prioritizing compatibility and dependable serial communication, this pcie serial card for industrial pc use is a sensible choice. It focuses less on extras and more on doing the core job well: connecting legacy RS-232 devices without complicating deployment.
Best for Mixed OS Industrial Installations – StarTech 2-Port PCIe RS232 Card
If you need a reliable pcie serial card for industrial pc setups, this StarTech card is a practical fit for legacy RS232 devices in PCs and servers. It adds two DB9 ports, supports Windows and Linux, and includes both low-profile and full-height brackets for flexible deployment.
Best For: Industrial users connecting PLCs, POS gear, scanners, sensors, or other RS232 equipment in mixed Windows/Linux environments.
Pros:
- Two RS232 ports with 16950 UART and up to 921.6 Kbps per port
- Includes low-profile bracket preinstalled plus a full-height bracket
- Optional pin 9 power output adds flexibility for supported devices
- Broad compatibility across Windows and Linux systems
Cons:
- RS232-only design won’t suit USB or other serial standards
- Not the cheapest option for simple single-device installs
For a pcie serial card for industrial pc deployments, this model stands out for dependable compatibility and straightforward installation. It is especially useful when you need two solid legacy serial ports without sacrificing support for compact cases or mixed operating systems.
Best for Legacy RS-232 Expansion – PCIE-SE2 2-Port PCIe RS-232 Card
If you need a reliable pcie serial card for industrial pc setups, the PCIE-SE2 is a straightforward way to add two DB9 RS-232 ports through a PCI Express x1 slot. It’s a practical fit for older serial hardware like POS terminals, scanners, printers, and control equipment, with support for both full-size and low-profile cases.
Best For: Industrial PCs, desktop systems, and legacy equipment that still depends on dual RS-232 serial connections.
Pros:
- Adds 2 RS-232 DB9 ports from a single PCIe slot.
- Works with a wide range of Windows versions and Linux kernels.
- Includes both full-size and low-profile brackets for flexible installation.
- Uses the ASIX AX99100 chipset with onboard FIFO for stable serial performance.
Cons:
- Requires driver installation, including Linux source compilation in some cases.
- Low-profile cases need the bracket swapped by hand.
- Only useful if your system has an open PCIe slot and RS-232 devices to connect.
For buyers comparing a pcie serial card for industrial pc use, this card stands out for its dual-port layout, broad OS support, and compatibility with common legacy devices. It’s a solid utilitarian choice when you need dependable serial expansion rather than extra features.
Best for Legacy RS-232 Connectivity – StarTech 2-Port PCIe Serial Card
If you need a pcie serial card for industrial pc use, this StarTech dual-port adapter is a practical way to keep RS-232 equipment running on modern systems. It adds two DB9 serial ports, supports Windows and Linux, and includes low-profile hardware for compact desktops or industrial boxes.
Best For: Industrial, logistics, lab, and automation setups that still depend on barcode scanners, PLCs, scales, receipt printers, or other legacy serial devices.
Pros:
- Dual RS-232 DB9 ports with 16C1050 UART support
- Low-profile brackets included, plus a full-height bracket for flexible installs
- COM retention and LED status lights make troubleshooting easier
- Supports Windows and Linux, with power on pin 9 for compatible devices
Cons:
- RS-232 only, so it will not replace other serial standards like RS-485
- Not the cheapest option if you only need one serial port
Overall, this is a solid pcie serial card for industrial pc builds where reliability and legacy compatibility matter more than flashy extras. The dual-port layout and bracket options make it especially useful for mixed fleets, older peripherals, and compact systems.
Best for Legacy COM Devices – 2-Port PCIe Serial Card with DB9 RS232
If you need a pcie serial card for industrial pc use, this 2-port adapter is a practical way to add reliable DB9 RS232 connections for legacy equipment, PLCs, sensors, and test gear. It supports common Windows versions plus Linux, and the included low bracket helps it fit smaller or industrial cases.
Best For: Industrial PCs and workstations that need two dependable RS232 COM ports for older serial devices.
Pros:
- Two DB9 RS232 ports for connecting multiple serial devices
- 16C550 UART and WCH382 chipset for broad legacy compatibility
- Works with Windows and Linux, with IRQ sharing and auto address selection
- Low bracket included for tighter or industrial chassis installs
Cons:
- Driver installation may require using the included CD files
- RS232 only, so it is not a fit for RS485 or USB-only setups
For buyers focused on dependable serial expansion rather than speed or modern features, this pcie serial card for industrial pc setups offers a straightforward two-port solution. It is a sensible pick when you need legacy COM support and flexible OS compatibility more than anything else.
Best for Legacy Industrial Devices – StarTech 1-Port PCIe RS232 Card
If you need a reliable pcie serial card for industrial pc setups, this StarTech option is built for legacy RS232 gear in server rooms, automation lines, labs, and POS systems. The single DB9 port, COM retention, and 16C1050 UART make it a practical choice when stability and device compatibility matter more than extra ports.
Best For: Industrial PCs and SFF systems that need dependable RS232 support for barcode scanners, PLCs, scales, printers, and other legacy serial devices.
Pros:
- 16C1050 UART and 256-byte FIFO help maintain solid serial performance
- Includes standard and low-profile brackets for desktop or compact installs
- COM retention and screw-lock DB9 support are useful in industrial environments
- Works with Windows and Linux, with pin 9 power support for compatible devices
Cons:
- Only adds one serial port
- Limited to RS232 devices, so it won’t replace other serial standards
- May be overkill if you only need a basic home-office serial adapter
For buyers comparing a pcie serial card for industrial pc use, this model stands out for dependable legacy-device support, compact-case flexibility, and features that fit real-world automation and lab deployments.
How We Picked the Best Pcie Serial Card for Industrial PC Use
For this roundup, we prioritized cards that make sense in real industrial environments: stable chipset support, broad OS compatibility, and bracket options that fit both full-height and low-profile systems. We also looked at port type, since many buyers need RS-232 only, while others need RS-422 or RS-485 for longer runs and noisier electrical environments.
Quick Comparison: What Matters Most
If you only need one simple COM port, a single-port adapter is often the cleanest choice. For multi-device machines, 2-port cards are the most common sweet spot, while 4-port models are better when you want to expand a control cabinet or embedded PC with fewer slots. Combo cards can be useful if you still support legacy parallel printers or lab gear, but they are usually a niche pick.
Key Buying Factors for Pcie Serial Card for Industrial PC
Serial Standard
Match the card to the device. RS-232 is still the default for many peripherals, while RS-422 and RS-485 are better for differential signaling, longer cable runs, and industrial noise resistance. Buying the wrong signaling type is one of the most common mistakes.
Chipset and Driver Support
Driver quality matters as much as hardware. Choose a card with clear Windows and Linux support, especially if you use newer versions of Windows or mixed operating systems. Stable UART chipsets are often preferred in industrial deployments because they reduce compatibility headaches.
Port Count and Expansion Needs
Think beyond today’s setup. If your machine may gain another sensor, scanner, or controller later, a 2-port or 4-port card can prevent another install down the road. But don’t overbuy if unused ports will just sit idle.
Bracket and Physical Fit
Industrial PCs often come in compact cases, so check for low-profile and standard bracket support before ordering. A card that fits electrically but not physically is still a bad purchase.
Who Should Buy Which Pcie Serial Card for Industrial PC?
If you need simple point-to-point device support, a 1-port or 2-port RS-232 card is usually enough. If your environment includes distributed machinery, long cable runs, or electrically noisy equipment, look for RS-422/RS-485 support. If you are building a control PC for mixed legacy hardware, a higher-port card or combo expansion card may offer the best long-term flexibility.
For most buyers, the best choice is the card that matches the exact serial standard, has proven driver support for your OS, and fits the available slot space in your industrial PC.