OPC (OPC UA) VS RS-232
As of 30 October 2026, RS-232 is named by 342 companies and OPC (OPC UA) by 350; OPC (OPC UA) skews to companies under 200 people (23% vs 39%), RS-232 to companies over 1,000 (38% vs 57%).
As of 30 October 2026 · refreshed daily · counts move as websites, DNS and career sites are re-read.
The website-and-DNS footprint is not comparable between a marketing suite and a CRM: OPC (OPC UA)'s script and mail records show on hundreds of thousands of small sites, RS-232 rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- OPC (OPC UA): 2–200 employees
- 23%
- RS-232: 2–200 employees
- 39%
- OPC (OPC UA): 1,000+ employees
- 57%
- RS-232: 1,000+ employees
- 38%
- Postings per company, 90 days
- 3.1 · 2.6
- Website or DNS footprint
- 0 · 0
Who chooses which
Share of each tool's companies in every segment. "Leans" marks a gap of more than two points.
| Segment | OPC (OPC UA) | share | RS-232 | share | Leans |
|---|---|---|---|---|---|
| Self-employed | 1 | 0% | 1 | 0% | even |
| 2-10 employees | 10 | 3% | 13 | 4% | even |
| 11-50 employees | 21 | 6% | 49 | 14% | RS-232 |
| 51-200 employees | 50 | 14% | 71 | 21% | RS-232 |
| 201-500 employees | 37 | 11% | 46 | 13% | RS-232 |
| 501-1000 employees | 33 | 9% | 31 | 9% | even |
| 1001-5000 employees | 75 | 21% | 51 | 15% | OPC (OPC UA) |
| 5001-10000 employees | 33 | 9% | 20 | 6% | OPC (OPC UA) |
| 10,001+ employees | 90 | 26% | 60 | 18% | OPC (OPC UA) |
| Segment | OPC (OPC UA) | share | RS-232 | share | Leans |
|---|---|---|---|---|---|
| Manufacturing & industry | 124 | 35% | 180 | 53% | RS-232 |
| Utilities & infrastructure | 54 | 15% | 12 | 4% | OPC (OPC UA) |
| Technology & software | 46 | 13% | 53 | 15% | RS-232 |
| Business & finance services | 42 | 12% | 33 | 10% | OPC (OPC UA) |
| Property & construction | 33 | 9% | 13 | 4% | OPC (OPC UA) |
| Automotive | 15 | 4% | 16 | 5% | even |
| Commerce & trade | 13 | 4% | 7 | 2% | even |
| Public, community & associations | 6 | 2% | 7 | 2% | even |
| Transport, logistics & rental | 5 | 1% | 7 | 2% | even |
| Consumer services & leisure | 4 | 1% | 5 | 1% | even |
| Media & content | 4 | 1% | 5 | 1% | even |
| Agriculture & forestry | 2 | 1% | – | – | outside top 12 |
| Health care | – | – | 2 | 1% | outside top 12 |
| Segment | OPC (OPC UA) | share | RS-232 | share | Leans |
|---|---|---|---|---|---|
| United States | 191 | 55% | 210 | 61% | RS-232 |
| United Kingdom | 28 | 8% | 21 | 6% | even |
| Germany | 23 | 7% | 21 | 6% | even |
| France | 23 | 7% | 11 | 3% | OPC (OPC UA) |
| Canada | 12 | 3% | 11 | 3% | even |
| Netherlands | 8 | 2% | – | – | outside top 12 |
| Switzerland | 6 | 2% | – | – | outside top 12 |
| Austria | 5 | 1% | – | – | outside top 12 |
| India | 5 | 1% | 17 | 5% | RS-232 |
| Italy | 5 | 1% | 8 | 2% | even |
| Spain | 4 | 1% | 4 | 1% | even |
| Sweden | 4 | 1% | 4 | 1% | even |
| Singapore | – | – | 6 | 2% | outside top 12 |
| Poland | – | – | 5 | 1% | outside top 12 |
| United Arab Emirates | – | – | 3 | 1% | outside top 12 |
| Segment | OPC (OPC UA) | share | RS-232 | share | Leans |
|---|---|---|---|---|---|
| Engineering (non-software) | 588 | 43% | 560 | 47% | RS-232 |
| IT operations & business systems | 158 | 11% | 15 | 1% | OPC (OPC UA) |
| Software engineering | 77 | 6% | 431 | 36% | RS-232 |
| Skilled trades and field service | 63 | 5% | 60 | 5% | even |
| Product, program & project management | 55 | 4% | 4 | 0% | OPC (OPC UA) |
| Construction and civil | 30 | 2% | 1 | 0% | OPC (OPC UA) |
| Sales | 24 | 2% | 4 | 0% | even |
| Data & AI | 14 | 1% | – | – | outside top 12 |
| Customer service & success | 8 | 1% | 7 | 1% | even |
| Administration & office | 6 | 0% | – | – | outside top 12 |
| General management & consulting | 6 | 0% | – | – | outside top 12 |
| Quality, safety & environment | 6 | 0% | 5 | 0% | even |
| Arts media and entertainment | – | – | 2 | 0% | outside top 12 |
| Logistics warehouse and transport | – | – | 2 | 0% | outside top 12 |
| Manufacturing and production | – | – | 2 | 0% | outside top 12 |
The companies behind each column
Companies using OPC (OPC UA) →
Companies using RS-232 →
iot platforms protocols ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
RS-232 is named by 342 companies in job postings and OPC (OPC UA) by 350; 0 name both. (Breaknorm, 30 October 2026, https://breaknorm.co/compare/opc-vs-rs-232)
Read from the source, not self-reported
Every number on this page can be traced to a page we crawled or a posting we read. Full methodology →
- Job postingsRead hourly from career sites. A tool counts when the employer's own text names it as the team's system; both tools can count for one company.
- Website and DNSScripts and embeds on the company's pages, plus SPF, DKIM, MX and CNAME records of its domain that point at the vendor.
- SegmentsCountry, size and industry from the company profile built from its website.
- Not a reviewNo ratings, prices or feature claims. For those, read the vendors.
OPC (OPC UA) vs RS-232: questions
Which is more used, OPC (OPC UA) or RS-232?
By companies naming it in their own job postings, OPC (OPC UA) (350) over RS-232 (342). By website-and-DNS footprint, RS-232 (0 vs 0), because its scripts and mail records sit on many small company sites.
Who chooses OPC (OPC UA)?
23% of OPC (OPC UA) companies have 2 to 200 employees, against 39% for RS-232. 57% of OPC (OPC UA) companies have over 1,000 employees, against 38% for RS-232.
Do companies run both?
0 companies name both in their postings, usually OPC (OPC UA) in marketing and RS-232 in sales, or during a migration.
Where do these numbers come from?
From the employer's own text in job postings read hourly from career sites, and from scripts found on company websites in our crawl. No vendor data, no surveys.
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