Patent ID: 8659768

Claim:
A job processing device that is connectable to a host and processes a job transmitted from the host, wherein the host has a host interface enabling to perform a communication in a first connection mode via a first signal line and another communication in a second connection mode via a second signal line different from the first signal line concurrently, wherein the first connection mode is a mode for communicating in a first communication speed and the second connection mode is a mode for communicating in a second communication speed being slower than the first communication speed, the job processing device comprising: a device interface enabling to perform the communication in the first connection mode via the first signal line and the another communication in the second connection mode via the second signal line concurrently; a connection control unit configured to change said device interface from the second connection mode to the first connection mode when said device interface is connected to the host interface in the second connection mode and when an operation mode between the job processing device and the host is shifted from a first operation mode for processing a job to a second operation mode being lower in power consumption than the first operation mode; a connection establishing unit configured to establish a connection between the job processing device and the host in the first connection mode after changing the connection mode of the device interface by said connection control unit; and a mode control unit configured to shift the operation mode between the job processing device and the host to the second operation mode from the first operation mode after establishing the connection between the job processing device and the host in the first connection mode by said connection establishing unit.