| 摘要 |
PURPOSE:To easily detect a power failure without adding anything of special hardware. CONSTITUTION:The master device 1 of an automatic vending machine system which makes a communication on a master-slave basis is provided with a power failure detecting means 11 and once the power failure is detected, a synchronizing(SYN) signal is turned OFF; and that is detected by the SYN signal detecting means 21 and power failure detecting means 22 of a slave device 2 and once the power failure is detected, a function stopping means 23 stops the entire operation of the slave device 2, thereby preventing data from being lost. |
