Abstract: A control circuit is used in an apparatus such as a printer in order to detect status and conditions of the apparatus. The control circuit includes a main control board and a plurality of sensor boards. The sensor boards are connected in cascade to define a signal path that run through the plurality of sensor boards. Each sensor board is connected to a corresponding sensor that detects a status or condition in the apparatus, and provides a sensor output of the corresponding sensor to the signal path. When the main control board provides an activation signal to the first one of the plurality of sensor boards, each sensor board provides the corresponding sensor output onto the signal path at a predetermined timing. The sensor boards provide their sensor outputs in the order in which their are cascaded. The main control board receives the sensor output at the predetermined timing, the sensor output signal being output in an order in which the plurality of sensors are connected in cascade.