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DBI04311 is a digital input interface card, used with the Signal-Constructor system. It features 16 optically-isolated inputs, with a total of 92 digital inputs. It is capable of detecting input signals up to five volts, with greater signals resulting in pulses. The card is compatible with a variety of different types of digital signals, including DC, AC, and spring connections. It features an LED indicator to provide an indication of input signal strength. The card also has two pushbuttons for manual control of its inputs.