| 摘要 |
PURPOSE:To attain smooth communication between stations having different versions by providing a rewritable storage device and a comparison section discriminating between a version number of a communication control program in a reception packet and that in the storage device for the newer or older date. CONSTITUTION:The rewritable storage device 4 stored with the communication control program is connected to a transmission/reception circuit 1 connected to a computer network and the date of the version number of the communication control program received at the sender side is compared with that of its own station in the storage device 4 by a comparator circuit 2. When it is confirmed that the number of its own station is older, a controller 3 outputs a transfer request of a program in the new version to an opposite station. When the opposite station reads the program of the new version from the storage device 4 and transfers it, the content of the storage device 4 of its own station is rewritten on the program of the new version and a reception signal to the opposite station is outputted.
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