| 摘要 |
PURPOSE:To positively perform remote monitor control, by allowing the control of the three value conditions of an ON condition, an OFF condition and non-control by combining the three value condiftions with time sharing by the small number of frequency. CONSTITUTION:When monitor command signals SV1-SV9 are sent to branch stations from a coder of a key station and OSC1, detection circuits corresponding to each frequency work through AMP and FIL at the branch stations, and an input information is coded by means of a sequencer and OSC 2 is actuated and replies when a SV signal for self-calling. When controlling a specified item of a specified branch station from the key station, the control items of an operating portion are set to ON or OFF, a signal of the maintenance of the status quo CONT signal is first sent and the SV signals and ON or OFF signals are sent, the branch station receives the signals to control apparatuses to be controlled, and the sequencer replies a contact condition at the time when control is completed. |
