Abstract: An adjustable fastening mechanism generally including an adjustable clasp and a cord. The adjustable clasp has an inlet end, a fastener end, and a center core therebetween. In the preferred embodiment the adjustable clasp has an inlet and a radial port which are connected by a conduit. The inlet end of the adjustable clasp is narrower than the fastener end of the adjustable clasp. A helical groove is provided on the exterior of the adjustable clasp and extends from the radial port to an exterior bore near the fastener end of the adjustable clasp. The exterior bore extends through the solid center core of the adjustable clasp and is substantially perpendicular to the center axis of the adjustable clasp and helical groove.

Abstract: For use in a control system containing first and second devices coupled together for inter-device communication, a circuit for and method of distinguishing a failure of the first device from a failure of the inter-device communication and a real-time process control system employing the circuit or the method. In one embodiment, the circuit includes: (1) a device failure signal generator, associated with and separately powered from the first device, that communicates a device failure signal to the second device upon occurrence of a predetermined condition and (2) a device failure signal detector, associated with the second device, that detects the device failure signal. Detection of the device failure signal contraindicates a failure of the inter-device communication.