Philips TC8275, TC8277, TC8278 manual Alarm Input Operation

5.2.10MON-B Monitor Display

The secondary monitor output, designated as the MON-B monitor, is used for selecting analog full-screen displays of any one of the eight camera inputs, or to display a sequenced list of full-screen displays. The MON-B monitor output is analog and so digital functions such as quad compression, zoom and freeze are not available on the MON-B monitor.

The operator can either select full-screen displays of any camera to the MON-B monitor, or the displays can be selected automatically to the MON-B monitor screen as a result of an external alarm input. Full-screen camera views can be sequenced on the MON-B monitor. The MON-B monitor can also display the same images that are being displayed at any one time on the MON-A monitor.

The MON-B monitor sequence list can include any of the input cameras, as well as the quad images selected for the quad display monitor. The MON-B sequence list can accept up to sixteen entries and can include any input several times and in random sequence.

The sequence dwell times for the MON-A and MON-B monitors can be set separately by the operator via the menus.

5.2.11MON-B Button

Used to toggle the front panel control from MON-A control to MON B control and visa versa.

Fixed full-screen displays can be selected on the MON-B monitor by pressing MON-B followed by the appropriate arrow button. Each arrow button is mapped to a quadrant on the screen, and will alternately select the two cameras associated with that quadrant.

The MON-B monitor output is analog. Digital functions such as zoom and freeze have no effect on the MON-B monitor output. A flashing "MON-B" indication on the monitors advises the user that the front panel is controlling the MON-B monitor.

5.2.12ARROW Buttons (MON-B)

Used to select a camera for display on the MON-B monitor, provided that the MON-B button is pressed before the arrow button.

Each arrow button is mapped to a quadrant on the screen, and will alternately select the two cameras associated with that quadrant.

5.2.13SEQ Button (MON-B)

Sequencing on the MON-B monitor output may be toggled on and off by using the SEQ button.

To start sequencing while in the MON-B mode, press the SEQ key. Sequencing will commence at the MON-B sequence dwell time.

The MON-B monitor dwell time is programmable between 1 and 99 seconds.

The MON-B sequence list can contain up to 16 entries which are operator programmable via the menu. The sequence list can include any camera or the MON-A display in the list several times, and in random order.

To start/stop sequencing on the MON-B output, select MON-B followed by SEQ.

5.3Alarm Input Operation

The product is equipped with 4 alarm inputs (TC8277 Series) or 8 alarm inputs (TC8278 Series), each associated with its corresponding video input. System action during an active alarm includes on-screen indication of the camera in alarm (ALM), a front panel LED indicator, an alarm output relay and the MON-B monitor switching to the camera in alarm. If multiple cameras are in alarm, the MON-B monitor automatically sequences between the cameras in alarm at a preset dwell rate of 1 second.

The alarm inputs are configured as zero potential relay contacts, individually programmable via the menu to be normally open (NO) or normally closed (NC). Refer to the setup MENU to select the input configuration as NO or NC. Any alarm inputs can be enabled or disabled via the setup MENU.

Alarms may be cancelled (acknowledged) via a contact to ground on a rear panel input, or by pressing the SELECT button.

5.3.1Alarm Input Handling

There are three ways of handling alarms, which may be selected by the operator in the setup MENU.

5.3.2Latched Alarms

Alarms are latched as they become active. An alarm is cleared when the operator acknowledges it. There is no time out period.

Note: When the operator acknowledges (cancels) the alarm, it will be cleared whether the alarm input is still active or not.

Alarms that have been acknowledged by the operator will not be reactivated until the alarm input has ceased and then restarts.

5.3.3Timed-out (Captured) Alarms

Timed-out alarms are latched for a minimum time out period from the start of the alarm becoming active. The time out period is menu programmable. After expiration of the time out period, the alarm is automatically cleared.

Alarm inputs that are still active after the time out, become manual type alarms. Alarms that cease and restart before the time out is complete, will restart the time out period. Timed out alarms can be cleared by the operator before they time out. Alarms that are cleared before their inputs have ceased, will not be reactivated until the alarm input ceases and restarts.

5.3.4Manual Alarms (No Capture)

Alarms are active only while the alarm input is active. As soon as the alarm input ceases, the alarm is cleared.

5.3.5Clearing Alarms

Alarms are cleared by pressing SELECT/ALARM CLR, or by pulling a rear panel contact (pin 4) to ground. Refer to the rear panel drawing for the location of the contact.

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