| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for realizing interchangeability between first specification and second specification, that is, the different versions of the same specification. SOLUTION: A header area is present in a reserved data area. At the time of transmitting data, when a reserved data area E is not provided with any valid data according to second specification, status information 'reserved' is applied to the header area, and when a reserved data area G is provided with valid data according to the second specification, status information 'valid' is applied to the header area. Also, at the time of receiving data, the status information is extracted from the header area, and when the status information is 'valid', it is judged that the reserved data areas E and G are provided with the valid data according to the second specification, and when the status information is 'reserved', it is judged that the reserved data areas E and G are not provided with any valid data.</p> |
