Patent ID: 7289141

Claim:
An image supply device used in a recording system in which the image supply device and a recording apparatus communicate with each other via a communication interface, and image data is transmitted from the image supply device to the recording apparatus and recorded, wherein the recording apparatus gives priority to processing a command received from the image supply device even if the recording apparatus waits for a response from the image supply device, the image supply device comprising: command issuing means for issuing a predetermined command to the recording apparatus; reception means for receiving a signal from the recording apparatus after said command issuing means issues the predetermined command; determination means for determining whether or not the signal received by said reception means is a response to the predetermined command, in a case that said reception means receives the signal while waiting for the response to the predetermined command issued by said command issuing means; and control means for discarding the signal and for inhibiting issuance, for a predetermined time period, of a next command following the predetermined command to the recording apparatus while waiting for the response to the predetermined command, in a case where said determination means determines that the signal is not the response to the predetermined command.