| 摘要 |
PURPOSE:To reduce the cost, by enabling to reduce the number of lines of transmission lines connecting the terminal unit and the central control unit, by adding comparatively simple circuit to the interface circuit of transmission line. CONSTITUTION:The inversion circuit 17 is connected between the transmission line 18 and the selector switch 13. Before the operation of commuter ticket issue machine, FF circuit 19 is reset and the first data communication unit 10 is formed in operationable state. When the data communication of input section 5 is finished, the end signal is fed to the central control circuit 9 and the print section 6. The print section 6 transmits the signal transmitting the possibility of print to the central control circuit 9 via the second data communication unit 11. The central control circuit 9 sets FF circuit 19 and makes operationable the second data communication unit 11, the print pattern signal is transmitted to the print section 6 and the commuter ticket is printed. When the issuing work is finished, the print end signal is delivered from the print section 6, and the second data communication unit 11 is again interrupted with the central control circuit 9 and the first data communication unit is made operationable. |
