BCD CONVERSION APPARATUS

PROBLEM TO BE SOLVED: To cancel trouble in hand-over between an output device and an input device for BCD data without modifying these devices.SOLUTION: A BCD conversion apparatus 3 starts fetching BCD data from an output device (S501). First-time BCD data are fetched first (S502). Next, after waiting for the passage of time of a data fetch timer value (S503), second-time BCD data are fetched (S504). If the first-time and second-time BCD data are matched (S505:YES) and its numerical value is 0 to 9 (S506:YES), the number of times of error is set to 0 (S507). Then, the BCD data are set to a memory (S508) and these BCD data are displayed on a display (S509). A read system of an input device is acquired (S510) and in accordance with that system, BCD data are transmitted (S511). After waiting for the passage of time of a refresh timer value (S512), fetching of BCD data is then started again (S501).