Apparatus and methods for applying fasteners during endoscopic surgery. Under control of a mask register and device select reroute circuit, if a configuration command on the primary interface attempts to activate the IDSEL line associated with one of the private, or reroute, devices on the secondary interface, a different IDSEL is activated to select a monitoring device on the secondary interface. The pulling means is an elongate woven pulling means having different warp densities which is fastened to the airbag by a first end portion of low warp density, preferably by stitching, and is coupled to the activation unit by a longitudinal portion of high warp density. The phase detector portion outputs a phase detector signal based on the divided reference signal and the divided feedback signal.