Abstract: To rotate a transport motor and to stop a carriage motor at an ADF reading angle, a control unit outputs a first and a second signal to a first and a second D/A converter, and a power on/off signal to an A-phase driver circuit for the carriage motor. The D/A converters convert the signal to a first and a second voltage. A transport motor driver supplies power to the transport motor on the basis of the first voltage, and a carriage motor driver turns on and off power supply to the A-phase on the basis of the first voltage and the power on/off signal, and supplies power to a B-phase on the basis of the second voltage.

Abstract: A printing apparatus with a plug-and-play execution unit includes a plug-and-play control unit and a permission receiving unit. The plug-and-play execution unit can perform predetermined communication processing with an external control apparatus, and the predetermined communication processing is triggered by a connection with the control apparatus when the connection is established via a predetermined communication path. The plug-and-play control unit is configured to prohibit the plug-and-play execution unit from operating in a case where an instruction for activating the printing apparatus according to a specific operation mode is received from an outside source, so that the plug-and-play execution unit is prevented from performing the communication processing. The permission receiving unit is configured to receive permission for execution of plug and play.

Abstract: A printer is provided which reliably detects front and back sides of a print medium and the print data to be printed to the respective sides, and automatically prints print data to the correct side of the print medium. A print command interpreter 203 interprets a print command received from the host device to determines the print medium side indicated by the print command for printing associated print data. An inserted side detecting means 207 detects which side of the print medium inserted to the printer is facing a particular direction. Control units 204 and 208 print the print data when the print medium side detected by the print command interpreter 203 and the print medium side detected by the inserted side detecting means 207 are the same. Data can thus be printed to a desired specific side of the print medium because the printer 10 can reliably print to the print medium side specified by the host 220.