FLD-496SA
5
A00474-1A
The Remote Mode allows daisy chaining
the local modems so that the signal is
sent down one fiber and back up another
fiber to multiple intersections with the
signal being regenerated at each local.
This allows the use of just a pair of fibers
with no restriction on the physical length
of the system as long as no individual
"hop" is longer than the range of a
Modem.
The power cord should be plugged into a
standard 3-prong receptacle that will
supply 90 to 135 VAC 60 Hz. If Battery
back up is required, the battery should be
installed just before powering up the
modem. The battery will start supplying
power as soon as it is plugged in and the
front panel switch is "ON". Therefore
make sure that the Battery switch is in the
"OFF" position until the Modem is
powered up and installed. The battery
will last about 8 hours of power failures.
The battery can be tie-wrapped in place
through the holes in the board and the
holder.
The ST and FC connectors for the Fiber
Optic cable are on the front panel.
NEVER
LOOK INTO THE EMITTERS.
The
Batteries may be supplying power to the
emitters. The light from the emitters is in
the infrared region of the spectrum and
can't be seen by Humans. The light maybe
intense enough to damage the retina of
the eye. Leave the protectors on unused
ports.
In the Master Mode of operation, both
Emitter 1 and Emitter 2 have the same
data on them and this is sent down stream
to the Remote or Local controllers.
Detector 1 and Detector 2 receive data
from the Local or Remote controllers.
One set (EMT1, DET1 or EMT2, DET2)
can be left unused.
In the Remote Mode of operation, data
coming down stream from the Master
goes in DET1 and is regenerated and sent
out EMT2. EMT2 of the first Remote is
then connected to the next Remote Modem
DET1 in line. Data coming upstream to
the Master comes into DET2 on the
Remote Modem, is regenerated and sent
out EMT1 which is connected to the next
Remote going upstream or DET1 or
DET2 of the Master Modem.
The fiber optic cables cannot be bent
sharply. A sharp bend may cause
attenuation in the cable or may cause the
glass fiber to fracture. The cables
attached to the modem should be
supported.
The only adjustment in the FLD-496SA
is an FSK output level located on the PC
Board. To adjust the Level Potentiometer
you must remove the cover of the FLD-
496SA. The cover can be removed by
taking out the two screws on either the
front or back panels and removing the
panel and then sliding the cover off.
Be
CAREFUL—There is 120 VAC
on the
Board. Turning the Pot Clockwise
increases the output level. Outputs greater
than 0 dB can be obtained.
FLD496SA-2 and used ports
If DET 2 of the FLD-496SA-2 is not being
used in either a Master or Local/Slave
(last Slave in a Line) application, the
DET 2 should be disabled. This is
done by removing the jumper located
inside the case near DET 2. The jumper is
connected to R24 and C47. The jumper
shunt should be kept on one of the posts
of the header so it won't
