Hardware Installation
SCX 920 Installation Guide 21
The inputs are on the lower left side of the SCX 920. Input wires should
enter from that side. Notice that the inputs are labeled RET, 1, 2, RET,
3, 4, and so on. The first return terminal goes to the first two inputs, the
second to the next two inputs, and so on.
Figure 6 shows a thermistor attached to an input point. One lead
connects to the numbered input terminal, the other to a return terminal.
Figure 6. Wiring Diagram for Thermistor Input
Follow these steps:
1. Slip the first wire for the first sensor under the input point screw for
input 1 and tighten the screw down on it.
2. Slip the first wire for the second sensor under the input point screw
for input 2 and tighten the screw down on it.
3. Slip the ground wires from both the first and second sensors under
the RETURN screw above input point 1 and tighten the screw down
on them.
4. Repeat the steps 1 through 3 for each pair of inputs.
Figure 7 shows a counter wired to an input point.
Figure 7. Wiring Diagram for Counter or Digital Input
1 (input point 1)
RET (return)
1 (input point 1)
RET (return)
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