| 摘要 |
PURPOSE:To surely ana quickly promote mutual understanding between a master station as a seller and a slave station as a buyer. CONSTITUTION:A slave station consists of an input part 11, a purchase key 12, a delay time setter 13, a slave station code setter 14, a reception part 15, a control part 16, a purchase lamp 17, a materialization lamp 18, and a transmission part 19. A master station 20 consists or an input part 21, a reception part 22, a measuring part 23, a discriminating part 24, a read part 25, a control part 26, and a display part 27. Independently, a display device 30 for public announcement is installed near the master station 20 and is operated on the master station side. When 'purchase' is transmitted from the slave station side in a form of the slave station code and the master station receives it to discriminate it based on the pattern of the change with time of the field intensity of the transmission radio wave that the number of slave stations for 'purchase' is one, the master station informs the pertinent slave station or all slave stations or 'materialization' after repeating this operation to confirm that it is true. |
