| 摘要 |
PURPOSE:To read out discrimination information without limitations of a conveyance direction and a conveyance speed and without superposing a noise radio wave and causing a conflict between signals. CONSTITUTION:The ID receiver 1 on a delivery vehicle 3 gathers discrimination information received from the ID transmitters of loads a1-a3 and sends it out to a mobile terminal 2. The mobile terminal 2 on the delivery vehicle 3 stores the discrimination information from the ID receiver 1 in a storage part. The mobile terminal 2 sends the discrimination information in the storage part to fixed terminals 4-1-4-2 at distribution centers 5-1 and 5-2 in response to read requests from the fixed terminals 4-1-4-2. The fixed terminals 4-1-4-2 repeats the discrimination information from the mobile terminal 2 to a host computer 6 through lines 100-1 and 100-2. The host computer 6 grasps the loads a1-a3 currently on the delivery vehicle 3 from the discrimination information repeated by the fixed terminals 4-1 and 4-2 and calculates the arrival and shipment of the loads a1-a3 from the difference from last received discrimination information. |
