Hardware Installation
SCX 920 Installation Guide 27
Figure 14. Five Positions on Odd Numbered Override
Switch
The five positions on any odd numbered switch set the output as marked
if it is tristate. If you use the odd numbered output as a voltage or cur-
rent output, both ON and –ON set the output to ON. If you use the odd
numbered output as a Form C output, –ON does not set the output to
ON, but all other switches set the output as marked.
Table 5 shows how switch settings change for the different outputs.
Connecting Modules to the Expansion Port
The expansion port at the bottom center of the controller board allows
you to connect modules to expand the capabilities of the controller.
Contact your Andover Controls representative for more information on
expansion modules.
Table 5. Corresponding Override Switch Settings
for Different Outputs Types
Tristate Form C Voltage Current
–ON Not Applicable ON ON
OFF OFF OFF OFF
AUTO AUTO AUTO AUTO
OFF OFF OFF OFF
+ON ON ON ON
Already Marked for Tristate Outputs
x
- On
Off
Auto
Off
+On
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