Security and Data Technologies, Inc. (SDT) is your answer to the design and supply of electronic alarm systems. SDT is, located in Bucks County, PA, was incorporated in 1988. SDT's team of Sales Consultants, Design Engineers, and trained Technicians recommend, design, and supply the best systems for your facility. From layout sketches, our in-house CAD operators develop risers and blueprints of the system layout.