Image forming device, method of switching modes, and computer-readable recording medium

A method of switching modes, comprising:

• receiving a request from an external device;
• acquiring a port number indicated by the received request and an information amount of the request;
• firstly determining whether or not the port number coincides with a specific port number;
• secondly determining whether or not the information amount is equal to or greater than a specific threshold;
• and
• switching an operation mode from a power-saving mode to a normal mode if the port number is determined to coincide with the specific port number and the information amount is determined to be equal to or greater than the specific threshold.

A non-transitory computer-readable recording medium that contains a computer program that causes a computer to function as:

• an acquiring unit that acquires a port number indicated by a request received by a receiving unit that receives the request from an external device and an information amount of the request;
• a first determining unit that determines whether or not the port number coincides with a specific port number;
• a second determining unit that determines whether or not the information amount is equal to or greater than a specific threshold;
• and
• a system control unit that switches an operation mode from a power-saving mode to a normal mode when the first determining unit determines that the port number coincides with the specific port number and the second determining unit determines that the information amount is equal to or greater than the specific threshold.