| 摘要 |
<p>Among a plurality of data items stored in a memory (10), at least one specified data item (10) alone is enabled to be updated. Accordingly, any data item other than the specified one is securely prevented from being updated. Therefore, when a data item other than those that do not need updating is specified as the data item for updating, there is no possibility of accidentally updating the data items that do not need updating. A memory stores data sets each having a plurality of data items each of which includes one or more fixed-length data items. The fixed-length data items have any one of two or more predetermined values, and can hold so-called switch type information. The operator can set one of the fixed-length data items to any one of the two or more predetermined values. <IMAGE></p> |
