Control device, control method, and non-transitory computer readable medium for using unused signal lines in case of error in communication interface

A control method comprising:

• when occurrence of an error in data communication through communication interfaces is detected, performing the data communication using unused signal lines among signal lines provided in the communication interfaces, wherein
• the unused signal lines are low-speed signal lines that are never used during normal operation without an error and that perform a limited operation than a signal line in which the error occurred in the communication interfaces.

A non-transitory computer readable medium storing a program causing a computer to execute a process comprising:

• when occurrence of an error in data communication through communication interfaces is detected, performing the data communication using unused signal lines among signal lines provided in the communication interfaces, wherein
• the unused signal lines are low-speed signal lines that are never used during normal operation without an error and that perform a limited operation than a signal line in which the error occurred in the communication interfaces.