37
Amended: Jan 2014
The network can be wired as either a Loop or a Radial. If Booster devices are used the system must
be run as a Radial
The maximum cable length before Boosters are used is 1000m.
The Terminator resistors are fitted across the network to smooth out the signal. The network requires
51ohms across pos & neg when checked at any card on the network, This can be achieved by cutting
off or soldering on resistors as required. (See Figs 32, 34, 35, 36 & 37)
On the later version network card this process has been improved by selecting the switches provided
on the PCB for loop topology or radial (bus) and terminator in or out.
NOTE
Connection details on the terminal block are not polarity sensitive.
Cable Types
The recommended cable for the network connection between panels is an enhanced cable
manufactured by Draka Cables (Pt No 910234). Screen continuity must be maintained throughout the
entire network circuit including each junction point.
The screen should only be earthed at the connection point at the first panel and not at any other point.
The screen or drain wire of the network cable should not be considered as a safety earth and
therefore should not be connected to the terminals marked with the earth symbol, except at the panel,
and should not be insulated with green/yellow sleeving.
Where the network passes between buildings, screen continuity should not be maintained from
building to building. A Booster device must however be used irrespective of cable length and should
be fitted at a suitable point in the link between buildings. The screen should be connected to the earth
of one panel in each building.
The L-Switch Booster is made by a firm called Loytec, and works on a supply voltage of 9-35 v DC.
This means that the Easicheck or DF6000 panel external 24v output can power this device.
The Booster has two
modes of operation ‘Smart Switch mode’ and ‘Configured Router’, for all
applications we use the former mode. In this mode the device automatically detects the bit-rates of
the connected channel, copies the information detected on the network and forwards it to the next
network card.
Configurations
Network configuration without Boosters - Radial
Fig 34
