SAE J1939 VS RS-422
As of 30 October 2026, RS-422 is named by 132 companies and SAE J1939 by 152; SAE J1939 skews to companies under 200 people (32% vs 42%), RS-422 to companies over 1,000 (30% vs 45%).
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: SAE J1939's script and mail records show on hundreds of thousands of small sites, RS-422 rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- SAE J1939: 2–200 employees
- 32%
- RS-422: 2–200 employees
- 42%
- SAE J1939: 1,000+ employees
- 45%
- RS-422: 1,000+ employees
- 30%
- Postings per company, 90 days
- 2.8 · 3.9
- 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 | SAE J1939 | share | RS-422 | share | Leans |
|---|---|---|---|---|---|
| Self-employed | 2 | 1% | 2 | 2% | even |
| 2-10 employees | 6 | 4% | 11 | 8% | RS-422 |
| 11-50 employees | 11 | 7% | 25 | 19% | RS-422 |
| 51-200 employees | 32 | 21% | 20 | 15% | SAE J1939 |
| 201-500 employees | 23 | 15% | 26 | 20% | RS-422 |
| 501-1000 employees | 10 | 7% | 9 | 7% | even |
| 1001-5000 employees | 25 | 16% | 20 | 15% | even |
| 5001-10000 employees | 9 | 6% | 4 | 3% | SAE J1939 |
| 10,001+ employees | 34 | 22% | 15 | 11% | SAE J1939 |
| Segment | SAE J1939 | share | RS-422 | share | Leans |
|---|---|---|---|---|---|
| Manufacturing & industry | 65 | 43% | 90 | 68% | RS-422 |
| Automotive | 27 | 18% | 1 | 1% | SAE J1939 |
| Technology & software | 24 | 16% | 14 | 11% | SAE J1939 |
| Business & finance services | 12 | 8% | 11 | 8% | even |
| Property & construction | 5 | 3% | 1 | 1% | SAE J1939 |
| Utilities & infrastructure | 5 | 3% | 7 | 5% | RS-422 |
| Commerce & trade | 3 | 2% | – | – | outside top 12 |
| Consumer services & leisure | 3 | 2% | 1 | 1% | even |
| Transport, logistics & rental | 3 | 2% | 4 | 3% | even |
| Agriculture & forestry | 2 | 1% | – | – | outside top 12 |
| Public, community & associations | 1 | 1% | – | – | outside top 12 |
| Hospitality & travel | 1 | 1% | 1 | 1% | even |
| Health care | – | – | 1 | 1% | outside top 12 |
| Media & content | – | – | 1 | 1% | outside top 12 |
| Segment | SAE J1939 | share | RS-422 | share | Leans |
|---|---|---|---|---|---|
| United States | 99 | 65% | 101 | 77% | RS-422 |
| Germany | 12 | 8% | 4 | 3% | SAE J1939 |
| France | 7 | 5% | 5 | 4% | even |
| Sweden | 6 | 4% | – | – | outside top 12 |
| United Kingdom | 5 | 3% | 3 | 2% | even |
| India | 4 | 3% | 1 | 1% | even |
| Australia | 3 | 2% | – | – | outside top 12 |
| Netherlands | 3 | 2% | 1 | 1% | even |
| Brazil | 2 | 1% | 1 | 1% | even |
| Canada | 2 | 1% | 3 | 2% | even |
| United Arab Emirates | 1 | 1% | 1 | 1% | even |
| Austria | 1 | 1% | – | – | outside top 12 |
| Belgium | – | – | 1 | 1% | outside top 12 |
| Spain | – | – | 1 | 1% | outside top 12 |
| Italy | – | – | 1 | 1% | outside top 12 |
| Segment | SAE J1939 | share | RS-422 | share | Leans |
|---|---|---|---|---|---|
| Engineering (non-software) | 201 | 39% | 366 | 56% | RS-422 |
| Software engineering | 184 | 36% | 221 | 34% | SAE J1939 |
| Skilled trades and field service | 15 | 3% | 19 | 3% | even |
| Product, program & project management | 9 | 2% | 3 | 0% | even |
| Sales | 8 | 2% | – | – | outside top 12 |
| IT operations & business systems | 7 | 1% | 3 | 0% | even |
| Customer service & success | 4 | 1% | – | – | outside top 12 |
| Logistics warehouse and transport | 4 | 1% | – | – | outside top 12 |
| Arts media and entertainment | 3 | 1% | – | – | outside top 12 |
| Quality, safety & environment | 3 | 1% | – | – | outside top 12 |
| Data & AI | 1 | 0% | 2 | 0% | even |
| Design & UX | – | – | 3 | 0% | outside top 12 |
| Manufacturing and production | – | – | 1 | 0% | outside top 12 |
The companies behind each column
Companies using SAE J1939 →
Companies using RS-422 →
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-422 is named by 132 companies in job postings and SAE J1939 by 152; 0 name both. (Breaknorm, 30 October 2026, https://breaknorm.co/compare/j1939-vs-rs-422)
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.
SAE J1939 vs RS-422: questions
Which is more used, SAE J1939 or RS-422?
By companies naming it in their own job postings, SAE J1939 (152) over RS-422 (132). By website-and-DNS footprint, RS-422 (0 vs 0), because its scripts and mail records sit on many small company sites.
Who chooses SAE J1939?
32% of SAE J1939 companies have 2 to 200 employees, against 42% for RS-422. 45% of SAE J1939 companies have over 1,000 employees, against 30% for RS-422.
Do companies run both?
0 companies name both in their postings, usually SAE J1939 in marketing and RS-422 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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