Patent ID: 8762593

Claim:
A data transmission system having a local device and a remote device, comprising: the local device including: a first connector that is connected to the remote device via a first cable; a second connector that is connectable to the remote device via a second cable; a first detector that detects the attachment and the detachment of the second cable to the second connector; and a first controller that communicates information on the attachment and the detachment of the second cable to the remote device via the first cable, changes a communication mode from a first mode to a second mode when the second cable is attached to the second connector, and changes the communication mode from the second mode to the first mode when the second cable is detached from the second connector, the first mode being a mode in which the first controller communicates with the remote device via the first cable, and the second mode being a mode in which the first controller communicates with the remote device via the first and the second cables; the remote device including: a third connector that is connected to the local device via the first cable; a fourth connector that is connectable to the local device via the second cable; a second detector that detects the attachment and the detachment of the second cable to the fourth connector; and a second controller that communicates information on the attachment and the detachment of the second cable to the local device via the first cable, changes a communication mode from the first mode to the second mode when the second cable is attached to the fourth connector, and changes the communication mode from the second mode to the first mode when the second cable is detached from the fourth connector.