| 摘要 |
Electronic device for the checking and identification of the state of several electrical contacts in series, specially suited for windows, doors, alarms, call signalers and the like, includes a circuit configuration, which calls for the connection in series of a number of micro-switches, connected to doors, windows and the like to be controlled, by means of a closed conductor on a source of direct current electric energy at very low voltage, a resistance positioned in parallel at each one of the said micro-switches, in such a way so as to be able to be short circuited, and thus be excluded from the closed micro-switch, and an electronic elaborator, essentially a micro-processor of known and fixed internal resistance, capable of receiving in entrance, the voltages arising at the heads of the said series of micro-switches, proportional to the values of said resistances in parallel at each opening of one or more of the micro-switches. Said micro-processor is pre-arranged and programmed in such a way, so as to be able to identify and point out , in the form of luminous and acoustic signals, based on relative resistances of said parallel resistances, the opening of each single micro-switch, as well as the contemporaneous opening of all the micro-switches. |
