The LDB-3 must be placed between the phone line and
the terminal device (phone) to be monitored. Connect
the incoming line to positions 1 and 2 and connect the
terminal device (phone) to positions 3 and 4.
D. Ring and Off-Hook/Loop Current Detection
If the application requires off-hook (loop) and ring detec-
tion, the LDB-3 must be placed between the phone line
and the terminal device (phone) to be monitored.
Connect the incoming line to positions 1 and 2, connect
the terminal device (phone) to positions 3 and 4.
B. Ring Detection Only
Connect the incoming line to terminal block positions 1
and 2 as shown in the diagram. No terminal device
(phone) is required. In this manner, the LDB-3 can mon-
itor for ringing any place along the ringing line.
A. DIP Switches
Sw 1
ON
OFF
ON
Sw 3
OFF
ON
ON
Description
Ring Detection Only (see section B)
Off-Hook/Loop Current Detection Only (see section C)
Ring and Off-Hook/Loop Current Detection (see section D)
Sw 2
ON
OFF
Ring Cadence Mode (see section E)
Ring Cadence Mode ON - relay remains activated in between rings.
Ring Cadence Mode OFF - relay is activated only during ringing.
P
P
r
r
o
o
g
g
r
r
a
a
m
m
m
m
i
i
n
n
g
g
F. Relay Contacts
Normally open and normally closed relay contacts are available at terminal block positions 7, 8, 9. The contacts are
rated at .5A @ 125VAC/1A @ 30VDC. If contacts are driving an inductive load, place a suppression device at the load
to snub high voltage spikes.
G. Switched 12V DC Output
The switched 12V DC output is a low current, 12-15VDC output that is turned on only while the ring/loop detect relay
is activated. This switched power output is ideal for lighting strobe lights or powering up any device that draws less
than 350mAmps. The positive side is available at terminal position 11, and the negative side is at position 10. Once
all the line and load connections have been made, plug in the 115 V AC wall adapter, and replace the cover.
E. Ring Cadence Mode
DIP switch 2 is used for switching between different ring detection modes. In the OFF position, the relay and switched
12VDC output will activate only while ring voltage is present and will turn off between rings. In the ON position, the
relay and switched 12VDC output will remain on for up to 5.75 seconds after the ringing has stopped. This allows the
relay and 12VDC to remain on between rings of a standard ring cadence. Note: To use the Ring Cadence Mode, ring
detection MUST be enabled (DIP switch 1 - ON).
(4 pagine)
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