NOVELTY - The circuit (32) has a set of resistors (42) that are arranged at a belt-side of the structure and configured to indicate one or more voltages across corresponding to an effective resistance of the support structure. The resistors are arranged at a monitor-side of structure and to indicate voltages across corresponding to an initial effective resistance of support structure. The seal is configured to prevent adjustment of switched resistor upon calibration and until subsequent calibration is required, the seal enabling reference to calibrated settings.    USE - Resistance circuit for monitoring support structure e.g. belt used in elevator system. Can also be used in belt or jacketed cord used in exercise machine, jacketed cable used with crane, or multi-strand wire or rope is used in tension.    ADVANTAGE - The seal can be transparent such that maintenance personnel can easily view the calibration settings as reference without need to remove the seal. The continuous monitoring of support structures can be provided and enable immediate responses to detect fault conditions.    DETAILED DESCRIPTION - The resistors are arranged in parallel relative to the support structure and the temperature-dependent resistor is arranged in series relative to the support structure, the temperature-dependent resistor is arranged in series with fixed-resistance resistor, the temperature-dependent resistor and the fixed-resistance resistor configured to approximate a temperature coefficient of tension within the support structure. The resistor provides voltage with different threshold for detecting a potential difference over tension within the support structure. The switched resistor is series-connected to successive switched resistor with a selectable resistance value that is decremented by a factor of one-half. The dual in-line package (DIP) of series-connected switched resistors approximates the initial effective resistance of the support structure upon calibration. A comparator (46) is configured to compare the one or more voltages across the resistors on the belt-side corresponding to the effective resistance of the support structure, with the one or more voltages across the resistors on the monitor-side corresponding to initial effective resistance of the support structure. INDEPENDENT CLAIMS are included for the following:    (1) monitoring system for a support structure; and    (2) method for calibrating a resistance-based monitoring system for a support structure.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of monitoring system.    Monitoring system (24)    Resistance circuit (32)    Interface circuit (34)    Resistor (42)    Comparator (46)