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7.15.7
Alarm Sense Setup (SW1 4-way DIP switch), Continued
Detection Logic
Once the status required is detected it is necessary to set the required ALARM ACTIVE
state. Sometimes this is for a high voltage swing and sometimes for a low.
In the NORMAL setting a high swing is detected as the alarm active condition. In the
INVERTED setting, a low voltage swing is detected as the alarm active.
Input Type
Some time-lapse VCRs provide an open-collector output, or dry contact output (relay).
To detect these contact closure conditions, it is necessary to bias the contact.
Select CONTACT CLOSURE to enable self-biasing of a dry contact alarm output circuit.
Select LEVEL SENSING for normal voltage level threshold detection.
Rev. C
Detection Logic
Normal
Inverted
Input Type
Contact Closure (Self Biasing)
Level Sensing
NOTE: For CONTACT CLOSURE input type, always set
the THRESHOLD LEVEL to 12V (SW1-1 and SW1-2 to
ON), as the internal self-biasing voltage is 5 volts.
7.15-6
SW-3
OFF
ON
SW-4
OFF
ON
HMXMU001018
10/06
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