Abstract: An apparatus for and method of operating a printer recognizes and allocates a unique identification (ID) to each of a plurality of trays, which are mounted in a printer as options. The apparatus includes a signal transmission unit transmitting a recognition signal to trays from a main frame of a printer, and a recognition unit reading the recognition signal from the trays, recognizing unique codes which correspond to the trays, and transmitting the unique codes of the trays to the main frame of a printer. The unique IDs of trays, which are mounted as options, can be recognized without a manual operation by a user, thereby giving convenience to the user and preventing errors from occurring during an operation of the printer.

Abstract: A printing apparatus having plural printing paper loading devices and a main controller. Each of the printing paper loading devices has a sub-controller to generate a test signal, and an inverting circuit of an open collector type to generate an output signal by performing an inverting operation with respect to an input signal. The printing paper loading devices are consecutively connected so that the output signal of one of the printing paper loading devices becomes the input signal input into another of the printing paper loading devices. The inverting circuit outputs a low level signal regardless of the level of the test signal when the input signal is high level, and outputs a signal of a same level as the test signal when the input signal is of the low level. Each of the sub-controllers sets its own ID based on the level of the output signal of the printing paper loading device corresponding thereto. The main controller receives the IDs set by the sub-controllers through a common bus.

Abstract: A printing apparatus having plural printing paper loading devices and a main controller. Each of the printing paper loading devices has a sub-controller to generate a test signal, and an inverting circuit of an open collector type to generate an output signal by performing an inverting operation with respect to an input signal. The printing paper loading devices are consecutively connected so that the output signal of one of the printing paper loading devices becomes the input signal input into another of the printing paper loading devices. The inverting circuit outputs a low level signal regardless of the level of the test signal when the input signal is high level, and outputs a signal of a same level as the test signal when the input signal is of the low level. Each of the sub-controllers sets its own ID based on the level of the output signal of the printing paper loading device corresponding thereto. The main controller receives the IDs set by the sub-controllers through a common bus.

Abstract: An apparatus for and method of operating a printer recognizes and allocates a unique identification (ID) to each of a plurality of trays, which are mounted in a printer as options. The apparatus includes a signal transmission unit transmitting a recognition signal to trays from a main frame of a printer, and a recognition unit reading the recognition signal from the trays, recognizing unique codes which correspond to the trays, and transmitting the unique codes of the trays to the main frame of a printer. The unique IDs of trays, which are mounted as options, can be recognized without a manual operation by a user, thereby giving convenience to the user and preventing errors from occurring during an operation of the printer.