Found a brochure with Touchscreen Digital sign in it:
http://www.imaginart.es/canales_com/Hyundai/pdf/Catalogo_Hyundai_monitores_profesionales.pdf
The company that does tech support in the U.S. is:
AVC Tech INC 777 MARK STREET, WOOD DALE, IL 60191 USA 1-630-595-0123
Maybe you can call them...