Hardware Installation
SCX 920 Installation Guide 19
3. Tighten the screw down on them until the screw holds the wires in
place.
4. Slip the second (usually black) wire from each Infinet cable under
the screw labeled with a minus sign (middle) and tighten the screw
down on them.
5. Slip the shields from the incoming and outgoing Infinet cables under
the screw labeled SHLD (bottom) and tighten the screw down on
them.
Wiring the Infinet to the Infinity CX 9000
You connect the last piece of Infinet cabling to the Infinity CX 9000.
See the Infinity CX 9000 Hardware Installation Guide for instructions.
Setting the Input Reference Resistor Switches
The inputs are on the lower left side of the SCX 920. To the right of the
inputs are two DIP switches, with small switches for each input. Look
closely at the switch and notice that each small switch is numbered.
Each small switch corresponds to the input with the same number.
If an input is either a thermistor or a digital input, switch its input refer-
ence resistor switch to IN. If you require the input be high impedance
(10 MΩ), set its input reference resistor switch to OUT.
Wiring the Inputs
Caution
Do not remotely ground any part of the sensor wiring. Remote grounds
connected to the SCX 920 return terminal could make the controller
operate incorrectly or damage the equipment. The signal return is not
true earth ground. It is an electronic reference point necessary to
interpret the sensor properly. Do not externally ground sensor or switch
terminals that return to the SCX 920.
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