86The alarm function activates the warning alarm status, whenan externally connected alarm sensor is turned on, or aninstalled Video Motion Detector (optional) is activated.The Disk Recorder activates the recording alarm statuswithin the specified recording mode; it also activates thestatus display, such as the ALARM indicator, monitor dis-play and alarm buzzer, to indicate that an alarm signal hasbeen received.Described below is an example of an alarm status activa-tion.For further details related to the recording of images duringan alarm, refer to chapter "Alarm Recording".■ Alarm InputThe Disk recorder can handle the following alarms.• Interface AlarmAlarm received from the ALARM port on the rear of theDisk Recorder.• Video Input Signal Loss AlarmAlarm indicating that a camera video signal loss hasoccurred."CH✽✽LOSS" is displayed on the monitor screen.• Motion Detector AlarmAlarm that the Disk Recorder detects a motion on thevideo image when the Video Motion Detector (optional)board is installed.■ Alarm OperationWhen an alarm signal is received, the Disk recorder, SpotOutput and Multiscreen Output of the Disk Recorder areactivated as shown below.Refer to the ALARM SETUP menu of the WJ-HD500 SETUPmenu for further settings.● Front Panel DisplayWhen an alarm function is activated, the ALARM indicatorand corresponding camera input button (1 to 16) blink.After the programmed time has elapsed, the indicatorchanges to a steady light.If another alarm is received during output of the previousalarm, the alarm signal is output for the programmed dura-tion.● Alarm BuzzerThe buzzer beeps for the programmed duration.The buzzer stops beeping before that duration when thealarm is reset.● Alarm LogThe alarm logs are stored in the Record List table or theERROR REPORT table.The tables also indicate the alarm mode.● Alarm NoticeWhen the optional Network Board is installed in the DiskRecorder, notice of the received alarm can be automaticallytransmitted to the Mail Address of the external device by e-mail.For further setting, refer to the Operating Instructions of theboard.● Monitor DisplayThe alarm-activated input image and alarm display are dis-played on the monitors as shown below.Described below are several examples; the selected modevaries, depending on the menu setting.• Alarm Spot Mode• The alarm-activated input image is displayed in theSingle Spot mode on the monitor.When another alarm is received, the display switch-es to the most recent alarm-activated input image inthe Single Spot mode.• The camera title and alarm display blink alternatelyon the monitor.• When a camera video signal loss has occurred, thedisplay switches to blackout.If the Disk Recorder plays back images on theMultiscreen Monitor, it quits playback and switchesto a blackout display."CH✽✽LOSS" is displayed on the monitors.• Alarm Ignore Mode• The camera images selected before the alarm wasactivated remain on the monitor screen.• If the alarm-activated input image is selected, thecamera title and alarm display blink alternately onthe monitor screen.CAM1 ALARMCAM1 CH 1LOSSALARM CONTROL FUNCTION