Comander Perimeter Security System
Engineering and Installation Manual
Page 11 of 72
Dedicated Timecode Device as Master
Dedicated time synchronisation devices such as Geoquip's Rugby Timecode Receiver
and the Wharton Master Clock series of GPS-synchronised time servers can be
connected directly to ports on the Comander Rack units. The Rack has a dedicated
socket on the rear panel for connecting a Geoquip Rugby Receiver.
If a Rugby device is connected, it must also be enabled in the General Hardware page
of the Configurator – see section 2.5.4.6 below.
A Wharton Master Clock can be connected to one of the COM serial ports, and the
serial port configured specifically for Wharton device connection - see section 2.5.3
below for COM port configuration details.
If any COM port is configured as a Wharton device, the local Comander Rack will
automatically synchronise to it. This time can then be broadcast from that Comander
to the rest of the network.
Comander as Master
If no external time source is available, one Comander Rack can be designated as the
Master time source for the system. The clock on this device can be set manually using
the Set Clock option in the Configurator Administration menu – see section 2.4.1
below.
Once the clock has been set, the master Comander Rack should be configured to
broadcast time synchronisation data across the system using the Time Synchronisation
options in the General Hardware Settings page of the Configurator – see section
2.5.4.6 below.
1.7 Audio Signal Processing
Interceptor cable works as a microphone, returning an electrical signal to the
Comander Rack. The audio signal is analysed by the Comander circuitry to generate
alarm or tamper signals in different circumstances.
The audio signal itself can also be monitored by control-room staff, using a simple
amplifier and speaker. When an Interceptor circuit goes into Alarm, the SMS will
normally send a command to switch on the audio stream from that circuit, whereupon
the digitised audio signal coming from that Interceptor is broadcast as a UDP stream
(on port 10001) across the network. If multiple Interceptors are in Alarm, the audio
signals from all of them are mixed together in the UDP stream.
Whenever the audio UDP stream is active, the audio is converted to analogue by every
Comander which is connected to the system, and is output from the Audio socket on
the rear panel.
The audio for each individual Interceptor circuit can also be made available form as an
individual UDP stream on a unique port number, using the Digitised Audio Configurator
option on the Comander to which it is connected – see section 2.5.12 below for details.
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