Patent ID: 8783816
Filing Date: 2014-07-22
Classification: B41J

Abstract:
1. An apparatus including a control unit which controls a device including a sensor, and a cable which connects the device and the control unit, comprising: a first signal line and a second signal line configured to be respectively laid out on the cable and to be respectfully connected to the sensor, wherein a voltage occurred between the first signal line and the second signal line corresponds to a state of the device; a differential amplifier circuit configured to be included in the control unit, amplify the voltage occurred between the first signal line and the second signal line, and output the amplified voltage as state information of the device; and an adjusting circuit configured to adjust a wiring resistance of the first signal line and a wiring resistance of the second signal line by grounding one of the first signal line and the second signal line via a resistor, wherein the sensor is a pnp transistor, the first signal line connects an emitter terminal of the pnp transistor and an input terminal of the differential amplifier circuit, the second signal line connects a base terminal of the pnp transistor and another input terminal of the differential amplifier circuit, and the resistor is connected between a grounded collector terminal of the pnp transistor and the base terminal.