Innotech Genesis V4 System - Manual (Page 88)

Installation Instructions for Innotech Genesis Systems
Edition 011100
A-7
A-4.2.2. Genesis I Connections. The Common connection provided by the tracks
on the printed circuit board permanently links the following points:
•
Terminal 2 (the Zero Volts of the AC supply)
•
Terminals 19 and 20 (the connections for the screens of the analogue inputs)
•
Terminal 91 (the connection for the screen of the Comms cable)
•
The shell and Pin 5 of the DB9 connector for RS232.
If the screen of the Comms cable is connected into Terminal 91, the screen will be earthed
via the earth connection on Terminal 2. To isolate the screen at a Genesis I Digital
Controller, the screen must not be connected to Terminal 91. To maintain the continuity of
the screen, it has to be joined externally from the Genesis I Digital Controller. Refer to
Figure A-7.
Figure A-7. Genesis I Connections.
Internal Connection to
Terminal 91 is Fixed &
Cannot be Opened.
1 2 19 20
Screen
89 90 91 92 93
Terminals 2, 19 & 20
(Screen), 91 & Pin 5
of RS232 are Joined
InsideThe Digital
Controller.
END CONNECTION,
SCREEN CONNECTED
89
90
91
92
93 89
90
91
92
93 89
90
91
92
93
LOOPING CONNECTION,
SCREEN CONNECTED
89
90
91
92
93
EQUIVALENT CIRCUIT
Screen Continuity Maintained
by Joining at Terminal 91
89
90
91
92
93 89
90
91
92
93 89
90
91
92
93
Screen Isolated From
Digital Controller Ground
by NOT Connecting at
Terminal 91
LOOPING CONNECTION, SCREEN ISOLATED