Source google image: https://www.installation-renovation-electrique.com/images/schemas%20de%20principe/schema%20de%20principe%20volet%20roulant.jpg
Schema electrique volet roulant somfy
Source google image: https://www.installation-renovation-electrique.com/images/schemas%20de%20principe/schema%20de%20principe%20volet%20roulant.jpg