Conventional Systems Technical Manual - Alcad

TV DOOR ENTRY SYSTEM INSTALLATIONSThere are two operating states: system on standby and system active.SYSTEM ON STANDBYThe video unit is activated; when the television in a dwelling is tuned to the TV channelselected in the modulator, the image captured by the video unit can be seen on thescreen.PanelCall made to dwelling 1Dwelling 1SYSTEM ACTIVEThe system changes from being on standby to being active when the telephonein a dwelling receives a call from an entrance panel.When a call is made to a dwelling from the entrance panel, the telephonein the dwelling emits a warning sound. It is also possible to see the image ofthe visitor on the TV by tuning the television to the TV channel selected in themodulator. It is possible to establish communication with the visitor by pickingup the receiver and to open the street door by pressing the lock releasebutton on the telephone.Note:The operation and characteristics in both states (system on stand-by, system active) are the same as those of an electronic doorentry installation.29