| 摘要 |
PURPOSE:To enable automatic data mode every time when the set specific time comes and to keep the telephone call mode in other time, when the data terminal unit and telephone set are connected to conventional telephone lines. CONSTITUTION:When the data is used for the data terminal unit of the system calling out the data terminal periodically from the managing center concentratedly managing and collecting the data, at the set time to call out the data terminal, the timer TMR outputs an output in the control circuit CNT when a set time comes to call out the data terminal, the relay TM is operated, the relay LK operated so far is restored, the call-out signal reception circuit such as the relay R is connected to the telephone lines to constitute the data mode. After that, when call out is present from the center, the relays R, C, CML are operated and after closing the DC loop, the data is delivered from the data delivery section MD. After the delivery of data, the relay EN is operated with the control circuit CNT, the timer TMR is started to start the next time limit operation and the relay LK is operated to constitute the telephone call mode. |
