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, modern computers lack native serial ports (RS-232, RS-422, RS-485), yet countless legacy industrial devices—PLCs, scales, barcode scanners, CNC machines, ATMs, and robotics—still rely on serial communication. The parallel card (serial expansion card) addresses this through legacy device connectivity: expansion interface cards in PCI, PCIe, or USB-adapter form factors that provide multi-port serial connectivity, enabling long-distance, low-interference, reliable data transmission. According to QYResearch’s updated model, the global market for Parallel Cards was estimated to be worth US$ 211 million in 2025 and is projected to reach US$ 255 million, growing at a CAGR of 2.8% from 2026 to 2032. In 2024, global sales of Parallel Cards reached approximately 5.2 million units, with an average market price of about USD 38. A Parallel Card is an expansion interface card for computers and industrial control devices, typically in PCI, PCIe, or USB-adapter form, providing RS-232, RS-422, or RS-485 serial communication ports. Its main function is to add standardized serial connectivity to a host system, serving needs in 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 often feature multi-port layouts, isolation protection, optimized drivers, and compatibility with mainstream operating systems, supporting hot-swap and remote management. They extend the operational life of legacy serial devices while offering a cost-effective and flexible connectivity solution for industrial and commercial systems, making them an essential bridge between traditional communication protocols and modern computing infrastructure.
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1. Product Segmentation by Bus Interface and Port Count
Parallel cards (serial expansion cards) are segmented by host bus interface, determining compatibility and data throughput:
| Interface | Bus Type | Typical Ports | Data Rate (max) | Key Applications | Price (USD) | Market Share (Units) |
|---|---|---|---|---|---|---|
| PCI (Legacy) | PCI (32-bit, 33MHz) | 2-8 | 115.2 kbps | Older industrial PCs (Windows XP/7), legacy systems | $25-50 | 15% |
| PCIe (Modern) | PCI Express (x1, x4) | 2-16 | Up to 1 Mbps | Modern industrial PCs, servers, workstations | $40-150 | 60% |
| ISA (Obsolete) | ISA (16-bit) | 2-4 | 115.2 kbps | Very old legacy systems (rare) | $20-40 | 5% |
| USB | USB 2.0/3.0 | 1-8 | 115.2 kbps – 1 Mbps | Laptops, portable systems, field service | $15-60 | 20% |
Key technical challenge – isolation and surge protection: Industrial environments have electrical noise, ground loops, and voltage surges that can damage host computers. Over the past six months, several advancements have emerged:
- MOXA (February 2026) introduced a PCIe serial card with 2.5kV isolation (optical coupling) and ±15kV ESD protection, preventing PLC/sensor surges from damaging host PC (critical in factory automation).
- Advantech (March 2026) commercialized a PCIe card with auto-detecting RS-232/422/485 ports (software-selectable), eliminating jumper configuration errors (common cause of field service calls).
- Digi International (January 2026) launched a USB-to-8-port serial adapter with built-in terminal block connectors (no soldering) and industrial DIN-rail mount, simplifying field installation.
Industry insight – multi-port density: 5.2 million units in 2024 = approximately 20 million serial ports added (average 4 ports per card). Higher port density (8-16 ports) has higher ASP ($80-150) but lower volume (15% of units). Single-port USB adapters dominate volume (40% of units) due to low cost ($15-20) and portability.
2. Market Segmentation: Interface and Application
The Parallel Cards market is segmented as below:
Key Players: Advantech, MOXA, Digi International, SIIG, StarTech.com, Brainboxes, Perle Systems, Lava Computer, Sealevel Systems, ADLINK Technology, SUNIX, Utek Technology, UGREEN, Langzhiguang Technology
Segment by Interface:
- PCIe – Largest segment (60% of 2025 revenue). Modern industrial PCs, high port density.
- USB – 20% of revenue. Portable, laptop-compatible, growing with field service.
- PCI – Declining (15% of revenue). Legacy system support.
- ISA – Minimal (5% of revenue). Very old systems, replacement market.
Segment by Application:
- Industrial – Largest segment (70% of revenue). Factory automation (PLC programming, machine monitoring), laboratory instruments (spectrometers, analyzers), robotics, CNC, test equipment.
- Commercial – 30% of revenue. POS systems (barcode scanners, receipt printers), ATMs (cash dispensers, journal printers), networking devices (console management), security systems (pan-tilt-zoom cameras).
Typical user case – PLC programming and monitoring: A factory automation engineer connects a laptop (no native serial) to a legacy Siemens S7-200 PLC (RS-485) via a USB-to-RS-485 adapter ($25). Software (Step7-Micro/WIN) communicates at 187.5 kbps, 1,000 meters distance (RS-485 supports long runs). 50 PLCs across factory → 50 adapters. Total cost: $1,250. Alternative: replace all PLCs with modern Ethernet models ($20,000+). Payback: immediate.
Exclusive observation – “serial to Ethernet” cannibalization: Serial device servers (convert serial to Ethernet/IP) are a competing technology, reducing need for host-based serial cards. However, device servers cost $100-300 per port (vs. $10-40 per port for multi-port PCIe cards). For systems with 8+ serial devices at a single location (e.g., test lab, factory cell), PCIe cards remain cost-effective. For distributed devices (across factory floor), device servers are preferred.
3. Regional Dynamics and Industrial Automation
| Region | Market Share (2025) | Key Drivers |
|---|---|---|
| Asia-Pacific | 45% | Largest industrial base (China, Japan, South Korea), electronics manufacturing, factory automation |
| North America | 25% | Legacy industrial equipment (automotive, aerospace), laboratory automation, POS/ATM replacement |
| Europe | 20% | German manufacturing (Industry 4.0 retrofits), medical devices |
| RoW | 10% | Emerging industrial automation, infrastructure |
Exclusive observation – “USB-C to serial” adoption: Modern laptops (Apple MacBook, Dell XPS, Lenovo ThinkPad) have only USB-C ports. USB-C to serial adapters are growing at 15% CAGR (vs. 2.8% overall market), with ASP $25-40. Key players: StarTech, UGREEN, Utek Technology, Langzhiguang Technology. Challenges: driver compatibility (Apple Silicon M1/M2/M3, Windows ARM), hot-plug reliability.
4. Competitive Landscape and Outlook
The parallel/serial card market is fragmented with both broadline and specialized suppliers:
| Tier | Supplier | Key Strengths | Focus |
|---|---|---|---|
| 1 | Industrial specialists | MOXA (Taiwan), Advantech (Taiwan), Digi (US), ADLINK (Taiwan), Sealevel (US), Brainboxes (UK) | Industrial-grade (isolation, wide temp), software support (Windows/Linux), long-term availability (10+ years) |
| 1 | Broadline/consumer | StarTech (US), SIIG (US), UGREEN (China) | Wide distribution, consumer price points, USB adapters |
| 2 | Regional/value | Perle, Lava, SUNIX, Utek, Langzhiguang | Regional focus, cost-competitive |
Technology roadmap (2027-2030):
- PCIe 5.0 serial cards – Higher bandwidth (32 GT/s) enables 10+ Mbps serial rates for high-speed instruments (Oscilloscopes, logic analyzers).
- Time-sensitive networking (TSN) serial cards – Deterministic timing for synchronized industrial control.
- Secure serial cards – Hardware encryption for military, government, financial applications (ATM, POS security).
With 2.8% CAGR and 5.2 million units sold in 2024 (projected 6.0M+ by 2030), the parallel/serial card market is mature but stable, driven by legacy device support and industrial automation retrofits. Risks include decline of legacy serial devices (replaced by Ethernet/IP), competition from USB-to-serial adapters (cannibalizing PCIe cards), and industrial PC trend toward integrated serial ports (reducing need for expansion cards).
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