Printing system, and printer and computer-readable medium therefor

A printer comprising:

• an operating unit configured to perform a pre-printing operation and a printing operation, the pre-printing operation being an operation to be performed to print an image with particular quality on a sheet in the printing operation;
• a communication interface;
• and
• a controller configured to perform:
• a first receiving process comprising receiving preparation instruction information from an information processing device via the communication interface, the preparation instruction information comprising information that instructs the printer to perform the pre-printing operation;
• a pre-printing process in response to receiving the preparation instruction information, the pre-printing process comprising controlling the operating unit to perform the pre-printing operation;
• a second receiving process comprising receiving print instruction information from the information processing device via the communication interface, the print instruction information being for instructing the printer to perform the printing operation based on print data;
• a print process in response to receiving the print instruction information and terminating the pre-printing process, the print process comprising controlling the operating unit to perform the printing operation in accordance with the print instruction information;
• and
• an issuance process in response to detecting a cancel trigger for cancelling an operation in execution, the issuance process comprising issuing a cancel notification.

A non-transitory computer-readable medium storing computer-readable instructions that are executable by a processor connected with a communication interface, the instructions being configured to, when executed by the processor, cause the processor to perform:

• a preparation instruction process comprising transmitting preparation instruction information to a printer via the communication interface, the preparation instruction information comprising information that instructs the printer to perform a pre-printing operation, the pre-printing operation being an operation to be performed by the printer to print an image with particular quality on a sheet in a printing operation;
• a generating process in response to performing the preparation instruction process, the generating process comprising generating print data based on image data specified by a user;
• a print instruction process comprising transmitting print instruction information to the printer via the communication interface, the print instruction information being for instructing the printer to perform the printing operation based on the generated print data;
• and
• a cancelling process in response to acquiring during the generating process a cancel notification issued by the printer, the cancelling process comprising cancelling the generating process and the print instruction process.