1-7
Appliance control may be performed in the 4100/4020 with the following
methods (note that all methods apply to a VNAC):
• Manual ON/OFF control with the 4100/4020 keypad (will cause a manual
override trouble on the VNAC)
• Switch mode activation (using ONOFF, TOF, PBT modes) if programmed
• Computer Port commands (SET, TRACK)
The same rules applied to standard 4100/4020 Signal Circuits apply to the
VNACs. A point is only turned on if the requested priority is ‘higher’ than the
point’s current priority and if the point is not in manual override trouble. If
the point is in manual override trouble, any command other than another
manual operation is ignored until the point is restored to automatic operation.
Only the TrueAlert VNACs may be enabled or disabled like other 4100/4020
Signal Circuits. This may be performed through:
• Disable /Enable key on 4100/4020 keypad
• Switch activation (DE, TDE if programmed)
• Computer Port command (DISABLE ON, DISABLE OFF)
Continued on next page
Operational Characteristics,
Continued
Appliance Control with
VNACs
TrueAlert Disabling/Enabling
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