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Wieseman&Theis - What you should know about us

W&T connects

serial, Ethernet, USB, PCI and IO



We develop our own products. This enables us for example to expertly address any problems that may occur in terms of the interoperability that we strive for.

Wiesemann & Theis GmbH
Porschestr. 12
42279 Wuppertal

Tel.: +49 202/2680-0
Fax: +49 202/2680-265

Company founded
1979 in Wuppertal


Chief Executive Officer
Dipl.-Ing. Rüdiger Theis

Commercial Registry
Wuppertal, HRB 6377

Sales Tax ID No.:
DE 121008340

WEEE registration
DE 77008276

BattG registration


We not only develop our own products, we also manufacture them ourselves so that they are continuously monitored and improved. The results speak for themselves: more than 99.9% quality and reliability in 2016. More...


A large inventory of finished and raw parts ensures that short delivery times are the rule even during the occasional semiconductor shortages.


We document product characteristics as clearly and completely as possible; and we answer your questions without delay.
We also are concerned with extreme long-term availability of our products. In our 25-year history we have never had to phase out a single product.

Engineering Firms

W&T works with a country-wide network of engineering firms. These firms will work in close cooperation with you to develop and implement on-site solutions. To find a contact near you, use our overview page of Engineering Firms.