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F. Auxiliary 12V DC Output
12V DC is available for low current applications. The positive side is available at terminal position 10, and
the negative side is at position 9. Once all the line and load connections have been made, plug in the 120
V AC wall adapter, and replace the cover.
Relay Closure
Time Out
A. Adjustable Relay Closure Time Out
The time out POT (see diagram above) can be adjusted from 2 to 6 seconds. Turn the time out
POT counter clockwise to decrease the closure time. Turn it clockwise to increase the closure time.
When monitoring for ring, turning the time out POT fully counter clockwise will allow the relay closure
to follow standard ring cadence, turning it fully clockwise will allow the relay closure to be maintained
during the entire off time of the ring signal. When monitoring for loop, the relay closure will be
maintained while off-hook and will time out following an on-hook.
B. Relay Contact Selections
The relay contacts located at terminal positions 5,6 and 7,8 can be set for normally open
(N/O
) or normally closed (
A. Ring Detection Only
With the LDB-2 in the ring detection mode, incoming ring will activate two relay contacts. The
contacts can be independently configured to be either normally open or normally closed. Once
ringing is detected it will remain activated for an adjustable time of 2-6 seconds. During the activation
time, if ringing stops, the relay will remain activated for the balance of the set time.
B. Ring and Loop Detection
With the LDB-2 in the ring and loop detection mode, incoming ring will activate two relay contacts.
The contacts can be independently configured to be either normally open or normally closed. Once
ringing is detected it will remain activated for an adjustable time of 2-6 seconds. During the activation
time, if ringing stops, the relay will remain activated for the balance of the set time. Additionally, the
LDB-2 will detect an off-hook condition. If the device goes off-hook at any time, either with or without
ringing, the relay will activate and remain activated for the duration of the off-hook condition.
Programming
Internal View of the LDB-2
1
2
3
4
5
6
7
8
N/C) by repositioning JP1 and JP2 respectively.
Operation
3
9 10
JP1
or
N/O
N/C
JP2
or
N/O
N/C
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