| 摘要 |
PURPOSE:To detect easily an error of transmit data and to resend the data from a transmission side when an error is detected by adding sum check data to the data and collating it with a sum check data generated on a reception side. CONSTITUTION:Data 7 stored in a transmit data area 1 is led out to a transmission part 2 and all words of the data 7 are summed up to generate sum check data before the data is outputted to a data line 6; and the sum check data is added to the data 7 and the resulting data is transferred through the data line 6. This transferred data is received by a reception part 13 and set temporarily, and the data 7 is sent to a data collation part 11. This collation part 11 sums up all words of the data 7 to generate sum check data, which is collated with the sum check data transferred from the transmission part 2. When they coincide with each other, the data 7 is stored as received data 8 in a received data area 4 and when they do not coincide with each other, that is reported to a transfer report code reception part 10 and the transmission part 2 resends the data. |
