Bosch AMC2 4W Installation Manual page 29

AMC2 4W | Installation manual
Grounding and Shielding
All components of the access control system must be
grounded. The grounding points shall then be connected to an
earth ground point. This insures that all components are prop-
erly protected against shock hazard.
It is good practice to shield all wires carrying low level signals.
You should connect only one end of the shield, preferably the
source end. Connecting both ends of a shield will result in
ground loops. It is recommended that the unconnected end of
the shield be insulated to prevent accidental connection.
The AMC2 4W enables you to set up a central ground or shield-
ing point, simply by setting a couple of jumpers. Set these
jumpers only if ground or shield is not connected otherwise.
WARNING!
Risk of damaging equipment!
When using multiple AMC2 4W devices, set the ground main
jumper only once to assure a central point star connection.
Fig. 5.4 Location of ground jumper RS-485 host interface
The jumper setting A1 shows the delivery status.
Bosch Sicherheitssysteme GmbH
Installing | en 29
F.01U.024.965 | V 0.1 | 2006.03