| 摘要 |
PURPOSE:To prevent a damage of data even in the fault state of a circuit, etc., by providing a circuit control computer between a POSECR and a master computer to form a multi-system POS. CONSTITUTION:A circuit control computer 31 receives the message of a POSECR(1n) and adds a proper number to the message. Both the transaction and the number of the message are stored. A master computer 15 reads these transaction and number and stores them. The computer 31 confirms the end of process of the computer 15 and feeds the transaction number to the corresponding terminal. The computer 15 processes the transaction and replaces a file. The transaction number is written for each file and kept until the next replacement. The computer 15 produces an answer, and the computer 31 sends back the answer and writes this answer. The transaction number and the message are erased out of the computers 31 and 15 respectively with the reception end signal of a terminal. |
