Parallel Cards: From RS-232 to PCIe—The Evolution of Industrial Serial Communication
公開 2026/03/31 15:42
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Global Leading Market Research Publisher QYResearch announces the release of its latest report “Parallel Cards - Global Market Share and Ranking, Overall Sales and Demand Forecast 2026-2032”. Based on current situation and impact historical analysis (2021-2025) and forecast calculations (2026-2032), this report provides a comprehensive analysis of the global Parallel Cards market, including market size, share, demand, industry development status, and forecasts for the next few years.
For industrial automation engineers, POS system integrators, and laboratory equipment managers, connecting legacy serial devices to modern computing platforms remains a persistent challenge. Parallel cards address this need as expansion interface cards for computers and industrial control devices—available in PCI, PCIe, or USB-adapter form—providing RS-232, RS-422, or RS-485 serial communication ports. Their primary function is adding standardized serial connectivity to host systems for factory automation, POS systems, networking devices, laboratory instruments, ATMs, and robotics. Compared with parallel connections, serial cards enable longer distance, low-interference, and reliable data transmission. Modern designs feature multi-port layouts, isolation protection, optimized drivers, and mainstream OS compatibility, supporting hot-swap and remote management. As essential bridges between traditional serial protocols and modern computing infrastructure, parallel cards extend the operational life of legacy serial devices while offering cost-effective, flexible connectivity solutions.
【Get a free sample PDF of this report (Including Full TOC, List of Tables & Figures, Chart)】
https://www.qyresearch.com/reports/6096410/parallel-cards
Market Size and Growth Fundamentals
The global parallel cards market was valued at US$ 211 million in 2025 and is projected to reach US$ 255 million by 2032, growing at a CAGR of 2.8% from 2026 to 2032. In 2024, global sales reached approximately 5.2 million units, with an average market price of US$ 38 per unit. Growth is driven by continued use of serial communication in industrial automation, legacy equipment integration, and the need for reliable long-distance data transmission in challenging environments.
Product Overview and Serial Communication Standards
Parallel cards provide standardized serial connectivity through multiple interface types:
RS-232: Single-ended communication up to 15 meters (50 feet); most common for legacy devices, POS terminals, laboratory instruments, and consumer equipment.
RS-422: Differential signaling for distances up to 1,200 meters; higher noise immunity; used in industrial environments and multi-point applications.
RS-485: Multi-drop differential signaling supporting up to 32 devices on single bus; industrial standard for factory automation, building control, and instrumentation.
Bus interface form factors:
PCI: Legacy bus for older industrial computers; declining but still present in installed base
PCIe: Modern bus standard for current industrial PCs; fastest-growing segment
USB: External adapter form factor for portable and consumer applications
ISA: Legacy bus for very old systems; niche replacement market
Key technical features:
Multi-Port Configurations: 2, 4, 8, or 16 ports per card
Isolation Protection: Surge and optical isolation for industrial environments
Driver Support: Windows, Linux, macOS, and real-time operating systems
Hot-Swap Support: Modern PCIe and USB implementations
Market Segmentation: Bus Types and Applications
The parallel cards market is segmented by bus interface type into:
PCIe: Fastest-growing segment for modern industrial PCs; higher bandwidth, hot-swap support, longer product availability
PCI: Largest installed base for legacy industrial systems; declining share
USB: Growing segment for portable and external applications; plug-and-play convenience
ISA: Niche replacement market for very old legacy systems
By application, the market spans Industrial and Commercial:
Industrial: Largest segment (approximately 65%), including factory automation, robotics, building automation, laboratory instruments, and networking equipment
Commercial: POS systems, ATMs, ticketing kiosks, and retail equipment
Competitive Landscape: Key Players
The parallel cards market features industrial computing specialists, serial communication experts, and connectivity solution providers:
Company Key Strengths
Advantech Industrial computing leader; broad serial card portfolio
MOXA Industrial serial communication specialist; rugged designs
Digi International Serial-to-Ethernet and connectivity solutions
StarTech.com Broad connectivity product line; consumer and industrial
Brainboxes Serial and I/O specialist; UK manufacturer
Perle Systems Industrial serial and terminal servers
Sealevel Systems, ADLINK Technology Industrial I/O and serial specialists
SIIG, Lava Computer Consumer and industrial connectivity
SUNIX, Utek Technology, UGREEN, Langzhiguang Technology Asian manufacturers; cost-competitive solutions
Recent Developments (Last 6 Months)
Several developments have shaped the parallel cards market:
Legacy Equipment Life Extension: December 2025–January 2026 saw continued demand for parallel cards as industrial facilities extend life of serial-based equipment (CNC machines, PLCs, lab instruments) rather than replacing entire systems.
PCIe Transition: Accelerating shift from PCI to PCIe in new industrial PC builds, with manufacturers expanding PCIe multi-port serial card offerings.
USB Serial Adapters: Growing adoption of USB-to-serial adapters for portable and field service applications, offering plug-and-play convenience for technicians.
Industrial Isolation: Enhanced isolation (2.5kV+ surge protection) becoming standard for industrial-grade cards, protecting expensive control systems from electrical noise.
Exclusive Insight: PCI/PCIe vs. USB Serial Cards—Embedded vs. Portable Connectivity
A critical market dynamic is the divergence between PCI/PCIe internal cards and USB external adapters based on application requirements.
PCI/PCIe Internal Cards (largest industrial segment) are characterized by:
Permanent Installation: Integrated into industrial PC chassis; secure mounting
Multi-Port Density: 8–16 ports per card; efficient use of expansion slots
Industrial Reliability: Extended temperature range, vibration resistance, isolation
Applications: Factory automation, robotics, building control, data acquisition
USB External Adapters (fastest-growing) are characterized by:
Portable: Plug-and-play; no chassis opening required
Single to 4 Ports: Lower port density; suitable for field service and temporary connections
Consumer-Friendly: Lower cost, simpler installation
Applications: POS terminal connections, legacy device programming, field service laptops
A 2026 industry analysis indicated that PCIe cards are the growth segment for new industrial installations, while USB adapters dominate portable and field service applications. Legacy PCI cards continue to serve existing installations.
Technical Challenges and Innovation Directions
Key technical considerations in parallel cards development include:
Driver Support: Maintaining compatibility with new operating systems (Windows 11/12, Linux kernel updates)
Isolation Voltage: Higher surge protection for industrial environments (2.5kV–4kV)
Signal Integrity: Maintaining RS-485/422 performance over long cable runs
Form Factor: PCIe cards in low-profile and half-length sizes for compact industrial PCs
Innovation focuses on:
PCIe over Cable: Remote serial port expansion via PCIe cabling
Industrial USB: Locking USB connectors and extended temperature USB adapters
Ethernet-to-Serial: Network-connected serial device servers for distributed I/O
Software Configuration: Virtual COM port mapping and device management tools
Conclusion
The parallel cards market is positioned for steady but modest growth through 2032, driven by legacy equipment life extension, industrial automation demand, and the need for reliable serial communication in harsh environments. For manufacturers, success will depend on PCIe adoption, isolation capabilities, driver support, and the ability to serve both industrial (PCIe/PCI) and commercial (USB) segments. While serial communication is mature technology, its reliability, long-distance capability, and extensive installed base ensure continued demand for parallel cards in industrial and commercial applications.
Contact Us:
If you have any queries regarding this report or if you would like further information, please contact us:
QY Research Inc.
Add: 17890 Castleton Street Suite 369 City of Industry CA 91748 United States
EN: https://www.qyresearch.com
E-mail: global@qyresearch.com
Tel: 001-626-842-1666(US)
JP: https://www.qyresearch.co.jp
For industrial automation engineers, POS system integrators, and laboratory equipment managers, connecting legacy serial devices to modern computing platforms remains a persistent challenge. Parallel cards address this need as expansion interface cards for computers and industrial control devices—available in PCI, PCIe, or USB-adapter form—providing RS-232, RS-422, or RS-485 serial communication ports. Their primary function is adding standardized serial connectivity to host systems for factory automation, POS systems, networking devices, laboratory instruments, ATMs, and robotics. Compared with parallel connections, serial cards enable longer distance, low-interference, and reliable data transmission. Modern designs feature multi-port layouts, isolation protection, optimized drivers, and mainstream OS compatibility, supporting hot-swap and remote management. As essential bridges between traditional serial protocols and modern computing infrastructure, parallel cards extend the operational life of legacy serial devices while offering cost-effective, flexible connectivity solutions.
【Get a free sample PDF of this report (Including Full TOC, List of Tables & Figures, Chart)】
https://www.qyresearch.com/reports/6096410/parallel-cards
Market Size and Growth Fundamentals
The global parallel cards market was valued at US$ 211 million in 2025 and is projected to reach US$ 255 million by 2032, growing at a CAGR of 2.8% from 2026 to 2032. In 2024, global sales reached approximately 5.2 million units, with an average market price of US$ 38 per unit. Growth is driven by continued use of serial communication in industrial automation, legacy equipment integration, and the need for reliable long-distance data transmission in challenging environments.
Product Overview and Serial Communication Standards
Parallel cards provide standardized serial connectivity through multiple interface types:
RS-232: Single-ended communication up to 15 meters (50 feet); most common for legacy devices, POS terminals, laboratory instruments, and consumer equipment.
RS-422: Differential signaling for distances up to 1,200 meters; higher noise immunity; used in industrial environments and multi-point applications.
RS-485: Multi-drop differential signaling supporting up to 32 devices on single bus; industrial standard for factory automation, building control, and instrumentation.
Bus interface form factors:
PCI: Legacy bus for older industrial computers; declining but still present in installed base
PCIe: Modern bus standard for current industrial PCs; fastest-growing segment
USB: External adapter form factor for portable and consumer applications
ISA: Legacy bus for very old systems; niche replacement market
Key technical features:
Multi-Port Configurations: 2, 4, 8, or 16 ports per card
Isolation Protection: Surge and optical isolation for industrial environments
Driver Support: Windows, Linux, macOS, and real-time operating systems
Hot-Swap Support: Modern PCIe and USB implementations
Market Segmentation: Bus Types and Applications
The parallel cards market is segmented by bus interface type into:
PCIe: Fastest-growing segment for modern industrial PCs; higher bandwidth, hot-swap support, longer product availability
PCI: Largest installed base for legacy industrial systems; declining share
USB: Growing segment for portable and external applications; plug-and-play convenience
ISA: Niche replacement market for very old legacy systems
By application, the market spans Industrial and Commercial:
Industrial: Largest segment (approximately 65%), including factory automation, robotics, building automation, laboratory instruments, and networking equipment
Commercial: POS systems, ATMs, ticketing kiosks, and retail equipment
Competitive Landscape: Key Players
The parallel cards market features industrial computing specialists, serial communication experts, and connectivity solution providers:
Company Key Strengths
Advantech Industrial computing leader; broad serial card portfolio
MOXA Industrial serial communication specialist; rugged designs
Digi International Serial-to-Ethernet and connectivity solutions
StarTech.com Broad connectivity product line; consumer and industrial
Brainboxes Serial and I/O specialist; UK manufacturer
Perle Systems Industrial serial and terminal servers
Sealevel Systems, ADLINK Technology Industrial I/O and serial specialists
SIIG, Lava Computer Consumer and industrial connectivity
SUNIX, Utek Technology, UGREEN, Langzhiguang Technology Asian manufacturers; cost-competitive solutions
Recent Developments (Last 6 Months)
Several developments have shaped the parallel cards market:
Legacy Equipment Life Extension: December 2025–January 2026 saw continued demand for parallel cards as industrial facilities extend life of serial-based equipment (CNC machines, PLCs, lab instruments) rather than replacing entire systems.
PCIe Transition: Accelerating shift from PCI to PCIe in new industrial PC builds, with manufacturers expanding PCIe multi-port serial card offerings.
USB Serial Adapters: Growing adoption of USB-to-serial adapters for portable and field service applications, offering plug-and-play convenience for technicians.
Industrial Isolation: Enhanced isolation (2.5kV+ surge protection) becoming standard for industrial-grade cards, protecting expensive control systems from electrical noise.
Exclusive Insight: PCI/PCIe vs. USB Serial Cards—Embedded vs. Portable Connectivity
A critical market dynamic is the divergence between PCI/PCIe internal cards and USB external adapters based on application requirements.
PCI/PCIe Internal Cards (largest industrial segment) are characterized by:
Permanent Installation: Integrated into industrial PC chassis; secure mounting
Multi-Port Density: 8–16 ports per card; efficient use of expansion slots
Industrial Reliability: Extended temperature range, vibration resistance, isolation
Applications: Factory automation, robotics, building control, data acquisition
USB External Adapters (fastest-growing) are characterized by:
Portable: Plug-and-play; no chassis opening required
Single to 4 Ports: Lower port density; suitable for field service and temporary connections
Consumer-Friendly: Lower cost, simpler installation
Applications: POS terminal connections, legacy device programming, field service laptops
A 2026 industry analysis indicated that PCIe cards are the growth segment for new industrial installations, while USB adapters dominate portable and field service applications. Legacy PCI cards continue to serve existing installations.
Technical Challenges and Innovation Directions
Key technical considerations in parallel cards development include:
Driver Support: Maintaining compatibility with new operating systems (Windows 11/12, Linux kernel updates)
Isolation Voltage: Higher surge protection for industrial environments (2.5kV–4kV)
Signal Integrity: Maintaining RS-485/422 performance over long cable runs
Form Factor: PCIe cards in low-profile and half-length sizes for compact industrial PCs
Innovation focuses on:
PCIe over Cable: Remote serial port expansion via PCIe cabling
Industrial USB: Locking USB connectors and extended temperature USB adapters
Ethernet-to-Serial: Network-connected serial device servers for distributed I/O
Software Configuration: Virtual COM port mapping and device management tools
Conclusion
The parallel cards market is positioned for steady but modest growth through 2032, driven by legacy equipment life extension, industrial automation demand, and the need for reliable serial communication in harsh environments. For manufacturers, success will depend on PCIe adoption, isolation capabilities, driver support, and the ability to serve both industrial (PCIe/PCI) and commercial (USB) segments. While serial communication is mature technology, its reliability, long-distance capability, and extensive installed base ensure continued demand for parallel cards in industrial and commercial applications.
Contact Us:
If you have any queries regarding this report or if you would like further information, please contact us:
QY Research Inc.
Add: 17890 Castleton Street Suite 369 City of Industry CA 91748 United States
EN: https://www.qyresearch.com
E-mail: global@qyresearch.com
Tel: 001-626-842-1666(US)
JP: https://www.qyresearch.co.jp
About Us：
QYResearch founded in California, USA in 2007, which is a leading global market research and consulting company. Our primary business include market research reports, custom reports, commissioned research, IPO consultancy, business plans, etc. With over 18 years of experience and a dedi…
QYResearch founded in California, USA in 2007, which is a leading global market research and consulting company. Our primary business include market research reports, custom reports, commissioned research, IPO consultancy, business plans, etc. With over 18 years of experience and a dedi…
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