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Bosch Security Systems 09/07 BLCC500R FTR1.02
Solution 16 i
Quick Start Guide
Copyright © 2007 E&OE
System Ear thing
When running a CET communications Earth as per
Figure 21, the communication earth should be connected
to the earth terminal on each module and then connected
back through the CET to the main building earth
conductor.
Do NOT connect the plug pack transformers earth wire to
any modules earth terminal.
If a separate Communications Earth wire is installed,
Do NOT connect the EARTH wire from any 3 wire
plug pack to any modules EARTH input terminal.
If a separate communications earth is NOT being used, then
you should connect the earth wire from the 3 wire plug
pack to the panels earth terminal as shown in Figure 20.
When using shielded cable, the shield of each length of
cable should only be connected to a protective earth at one
end. Do no allow the shield to make contact with negative
0 volts, ground or any other wiring within the system.
All earth wiring should be carried out in accordance with
the local wiring regulations in your area.
Term inating the LAN
For reliable operation the system LAN must be terminated
correctly. The control panel and all LAN modules include a
LAN TERM pin header and shunt which is used to connect
the termination resistor on the module.
When the shunt is installed between the Y pin and the
centre pin, the terminator is fitted and when the shunt is
between the N pin and the centre pin the terminator is not
fitted.
Where all modules are connected to the panel on a single
cable run, (Daisy Chained) the terminators should be
installed on the first and last modules on the LAN.
If the modules are connected to the panel via multiple cables
all running back to the control panel (Star Configuration)
then the terminators should be installed on the modules at
the end of the two longest cable runs.
There are no LAN terminators on keypads. If a keypad is
one of the two furthest devices from the control panel
then a 470 ohm 1/2watt resistor can be fitted at the keypad
between the LAN A and LAN B terminals.
In smaller installations where no LAN modules have been
installed there is no need to fit the termination resistor on
the control panel.
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