| 摘要 |
Changes in the electrical state of devices connected to a plurality of wiring terminals are detected and recorded by a data recording system programmed to evaluate the terminals singularly or in groups of various combinations. A central controller is programmed to generate terminal address data, either singularly or in groups of various combinations, and these terminal addresses are applied to a cable driver that partially decodes the address data into one of several selected terminal groups. The partially decoded terminal address data is applied to decoder/selectors for each of several major terminal groups wherein further decoding takes place. Only one of the detector/selectors is activated by the partially decoded address data to further decode the address to identify a particular terminal or group of terminals. The decoded data provides a control signal that actuates terminal gates for the selected terminals to couple a voltage at the terminals to a detector/control. The detector/control converts the voltage at the selected terminals into an electrical state code that is applied through the cable driver to the central controller. Coupled to the central controller is a recorder or other readout device for producing a hard copy display presenting the electrical state of the selected terminals.
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