Comander Perimeter Security System
Engineering and Installation Manual
Page 30 of 72
numbered cards within the rack(s), so that you can have some relays normally open
and some normally closed.
2.5.4.4 Monitored Contacts – Global Null Monitoring and Sensitivity
The Marshalling Box ADC Contacts option should be set to the total number of
contacts which are actually in use. ("ADC Contacts" means "Analogue to Digital
Convertor Contacts", since the signals from these circuits are converted and analysed
digitally.) As with Interceptor connections (see above), Contact connections should
start at 1, and be contiguous up to the total.
If you use ADC contacts, the specific configuration of each one
(eg resistor values) can be configured locally in your SMS
software, as well as in the Configurator.
The Marshalling Contacts Global Null Monitoring option controls whether null
monitoring is applied to the contact inputs. This single option affects all contact inputs
– Null Monitoring can only be enabled or disabled as a global option.
The Null Monitoring setting is only significant for circuits which have no resistors (ie
the serial resistor value is zero Ohms and parallel resistor as none). Ticking this box
allows a disconnection to be detected, by triggering a Tamper state.
The Marshalling Contacts Global Sensitivity option sets the level of voltage change
at which an alarm condition is triggered. Normally this is set to its maximum value
("Wide"), since contacts are generally configured as switches. But if an input is failing
to generate alarms because the change in its electrical state is not high enough, the
global sensitivity can be increased using this setting.
2.5.4.5 Audio
The Digital Audio Volume setting controls the level of the audio signal available from
the 3.5mm jack socket on the Comander Rack rear panel.
This signal is a mix of all the audio signals from the Interceptor cables connected to the
entire Ring system, whether from the local Marshalling Box, or via other Comander
units or Geoquip audio input devices.
2.5.4.6 Time Synchronisation
For an overview of Time Synchronisation in a Comander system, see section 1.6
above. The options explained here should be set in accordance with a properly
designed, system-wide time synchronisation strategy.
The Rugby Time Signal Enable option should be selected to synchronise the Rack unit
to a Geoquip Rugby Receiver Module connected to the dedicated socket on the Rack
rear panel. The unit will then synchronise to the Rugby time signal (and may also
synchronise with other time services on the network
The Send RealTime Clock to network every 10 minutes option makes the local Rack
broadcast a time signal to all other Racks on the network. It is normal to enable this
option only on units which synchronise with external timecode sources, such as a
Geoquip Rugby Receiver Module or Wharton Master Clock.
Whenever any other Rack unit on the network receives a timecode which is broadcast
in this way, it will synchronise its local clock to that timecode. It is normal for systems
to synchronise with multiple redundant timecode sources – see section 1.6 above.
The final option in this section, labelled Tick following box to enter a new time, is a
simple way of setting the local Rack's clock manually. It works exactly like the Set
Clock option in the Configurator's Administration menu.
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