| 摘要 |
Disclosed is a management system, which makes it possible to securely maintain the communication between the managing apparatus (host) and the managed apparatus (device) even when a certain malfunction has occurred in the network or the server. When the device cannot receive the request sent from the host, the device changes the communication mode from the bilateral communication mode to the unilateral communication mode, and then, when it becomes possible to receive the request, the device changes the communication mode from the unilateral communication mode to the bilateral communication mode to transmit the response to the host. Further, when the host cannot transmit the request to the device, or when the host cannot receive the response to the request, the host suspends an operation for transmitting the request, and then, when it becomes possible to receive the response to the request, the host resumes the operation for transmitting the request.
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