| 摘要 |
PURPOSE:To reduce the total transmission quantity-fed from a terminal device and to shorten the time for each circulation of polling, by adding intermittently a specific number of each terminal device to plural pieces of information sent successively from plural terminal device. CONSTITUTION:The relations are shown roughly in the diagram among the proper number codes P transmitted to terminals devices 3 from a center device 1 via a cable 2, the data D transmitted to the device 1 from devices 3 and the proper number information N added to the data D. That is, the information N is not added consecutively to the data D from the device 3 but with a necessary interval. For instance, the information N is added to the data D once in three times of polling. Thus it is possible to shorten the time for each circulation of polling. |
