Innotech Genesis V4 System - Manual (Page 103)

Installation Instructions for Innotech Genesis Systems
Edition 011100
A-22
A-4.2.11. Genesis II Comms. Isolated by Repeater. A GENII RPTR Repeater
Module provides electrical isolation for all data conductors and for the screen of the
Comms cable connected to Port 2 (Figure A-21). Therefore, Port 2 must be used to connect
the Comms cable going to the remote devices. The screen of the cable connected to Port 2
should be earthed at a device in Control Panel No. 2. Preferably, the earthing point should
be at the first device that the cable connects to in Control Panel No. 2.
If the screen is earthed by a local device, then the screen should not be connected to the
SHLD terminal of Port 1; this is to prevent an earth loop.
Figure A-21. Use of GENII RPTR Repeater Module, Circuit 1.
Switchboard or
Control Panel No. 2
Screen 1 2
Connect Screen
Screen 1 2
Connect Screen
Switchboard or
Control Panel No. 1
Screen 1 2
Connect Screen
Only four outer
links fitted.
Screen is not
earthed.
Only four outer
links fitted.
Screen is not
earthed.
Only four outer
links fitted.
Screen is not
earthed.
Screen 1 2
Connect Screen
Six outer links
fitted. Screen is
earthed via
Terminal 2.
E
art
h
2
1
Isolated
Not
Isolated
Repeater
Screen is NOT connected
on Port No. 1.