Innotech Genesis V4 System - Manual (Page 101)

Installation Instructions for Innotech Genesis Systems
Edition 011100
A-20
A-4.2.10. Genesis II Isolated Comms. To remove the possibility of damaging the
RS485 ICs, a GENII 485I Isolated RS485 Comms Card should be used. This card
electrically isolates the screen and signal wires from all circuitry on the Digital Controller.
It does not remove the electric shock hazard of the voltage difference between the screen,
which is earthed, in Control Panel No. 2 and the earth in Control Panel No. 1. Note that the
screen is earthed at one point only: the top Digital Controller in Control Panel No. 2.
Figure A-19. Use of GENII 485I Card, 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.
Screen 1 2
Connect Screen
Six outer links
fitted. Screen is
earthed via
Terminal 2.
Isolated
RS485
GEN485I Card
isolates Digital
Controller from
cable.