GDI COMMUNICATIONS FLD2SA Series User manual

FLD2SA-1S
FLD2SA-2S
Manual
Dual Port Fiber Optic Modem
Standalone
A00477-3 Rev. A
For FLD2SA A00197-3 Rev. A and newer
Serial numbers FLD-700084SA and up

GDI FLD2SA-1S & FLD2SA-2S Manual
A00477-3 Rev. A
GDI COMMUNICATIONS, LLC
879 Deming Way
Sparks, NV 89431
Phone [phone] Fax [phone]
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data with all rights and titles reserved by
GDI Communications LLC. By accepting this
document, the recipient assumes custody herof
and agrees not to dislcose this data or any portion
of this data to any unauthorized person without
the prior written consent of GDI Communications
LLC. Recipient further agrees not to incorporate
these drawings, specifications or technical
information, in whole or in part, in any other
product or endeavor.
THIS LEGEND SHALL BE INCLUDED ON
ANY REPRODUCTION OF THIS DOCUMENT

TABLE OF CONTENTS
GLOSSARY.................................................................................................................................................. 1
GENERAL DESCRIPTION........................................................................................................................ 2
GENERAL CHARACTERISTICS............................................................................................................. 4
RJ45 T ERMINATION T ABLE ........................................................................................................................ 4
DB9F T ERMINATION T ABLE ....................................................................................................................... 4
INSTALLATION.......................................................................................................................................... 6
C ONFIGURATION S WITCHES ........................................................................................................................ 6
TYPICAL SYSTEM OPERATION......................................................................................................... 10
T YPICAL S YSTEM CONNECTIONS : ............................................................................................................. 11
ADJUSTMENTS ........................................................................................................................................ 14

1
GLOSSARY
Anti-Streaming – A function on GDI
modems that prevents a Host from
transmitting continuously.
DCD – Data Carrier Detect. An EIA RS-
232D control signal that can be used to
gate RXD to a DTE.
DCE – Data Communications
Equipment. A device that converts data
from a DTE to a transport stream.
DTE – Data Terminal Equipment. A
device that initiates communication
over RS232 lines.
Detector – An optical port that converts
coherent light waves, received from a
fiber optic cable, to electrical data.
Emitter – An optical port that converts
electrical data to coherent light waves
for transmission through a fiber optic
cable.
CTS – Clear To Send. A EIA RS-232D
control signal that can be used to gate
TXD data from a DTE.
Full duplex – A communication system
where data can be transmitted in both
directions at the same time.
Half duplex - A communication system
where data can be transmitted in only
one direction at a time.
Host – Any DTE device.
Optical Port – A data communications
portal through which electrical data is
transmuted to single frequency
coherent light waves and then
transmitted through a fiber optic cable.
0 dBm – Represents the signal level
required to produce 1mw in a 600Ω
load.
Surface mount parts – Electronic parts
that are designed to be soldered to
pads instead of vias.
RXD – Receive Data. An EIA RS-232D
data signal that transfers information in
form of binary data to a DTE.
RTS – Request To send. An EIA RS-
232D control signal that can be used to
gate TXD to a DTE. The DTE asserts
RTS and then waits for the DCE to
respond with CTS.
NiMH – A rechargeable battery that
uses Nickel-Hydrogen chemistry. The
AA cells have a voltage of 1.2vdc.

2
GENERAL DESCRIPTION
The FLD2SA has four fiber optic ports:
two emitters and two detectors. This
allows a standard daisy chain
configuration with two fiber optic
cables running between each modem.
Since the signal is regenerated at each
modem there is no physical limitation
on the amount of remote intersections
that can be tied on a fiber network.
The main communications port, DB9F,
is switch settable for either RS-232 or
RS-485. The mode is indicated on the
rear panel by LEDs.
The FLD2SA is configured at the factory
for either 850nm Multi-Mode operation
or 1310nm Single-Mode operation.
Both versions can operate at 1200bps
to 115kbps.
The standard versions of the FLD2SA
are equipped with battery backup. The
rechargeable NiMH Batteries that can
power the FLD2SA for 6 hours after
power loss. This will maintain
communications through an
intersection that has lost power.
The Anti-Streaming function prevents a
single controller from continuously
transmitting. The Anti-Streaming time
can be adjusted using the rotary switch
(S1) located at the rear of the modem.
Rotate S1 to “0” to deactivate Anti-
Streaming.
Anti-Streaming is automatically reset
when the controller stops transmitting.
However, the Anti-Streaming LED will
remain on until the reset button (S3) is
pushed.
This allows the technician to see if a
controller ever had a problem and
allows the controller to operate
normally if the problem clears itself.
The NiMH batteries are assembled in a
DC power pack on the PC Board and
are easily replaceable. The charge
current and voltage are continuously
monitored to prevent overcharging and
over-discharging the batteries.
To protect the batteries if the
temperature drops to 0°
°°
°C or less, the
charger is disabled.
When the battery is fully charged, a
trickle charger is activated and keeps it
fully charged at all times.
The status LED indicates whether the
full charger is on (solid red) or when
the trickle charger is on (Turning on
and off slowly).
The FLD2SA has the option of using the
presence of data coming from upstream
to control CTS. This will prevent data
collisions between two controllers. The
CTS signal will hold off transmission
from the attached controller until the
data from upstream has passed
through.

3
An expansion port (RJ45 connector)
allows you to connect to another
FLD2SA. This effectively puts two
modems in parallel. If both modems
are set to Master mode, four networks
can be accessed.
When connecting between two next
generation FLD2SA units, no special
cable is required. An off-the-shelf CAT5
patch cable can be used, but an internal
switch must be set so one unit acts like
a DTE and the connected unit responds
like a DCE. The signals between units
are RS-232, and can be located up to 50
feet apart.
A custom cable is required when
connecting to an older generation
FLD2.

4
General Characteristics
PHYSICAL
CASE….. 8.77” x 5.75” x 1.5”
Weight………~2 lbs.
POWER:
Voltage……….90-135 VAC 47-63 Hz
Power…………..<5 Watts
ENVIRONMENTAL:
TEMP:………..-37°
°°
°to +74°
°°
°C
HUMIDITY…….5-95% non-cond.
BATTERY:
TYPE: …………..NiMH (5 AA Cells)
Or 9 V Lithium
Holdup time…………..~12 Hours
Charge time……..14 Hours @ 125 ma
RJ45 Termination Table
Pin Function
1
2
3
4 SGND
5 RXD
6 TXD
7
8
9
DB9F Termination Table
EIA-232 EIA-485
Pin Function Function
1 DCD*TXD+
2 RXD TXD-
3 TXD RXD+
4 RXD-
5 GND GND
6 RTS+
7 RTS RTS-
8 CTS CTS+
9 CTS-

5
FIBER OPTIC SECTION:
Receiver Sensitivity:
850 nm Multi-Mode….……-40 dBm
1300 nm Single-Mode……..-33 dBm
Transmitter Power:
LED
850 nm Multi-Mode……….-15 dBm
1310 nm Single-Mode…..-21 dBm (std)
CONNECTORS:
850 nm Multi-Mode…………ST
1300 nm Single-Mode LED….ST
FC is opt.
INDICATORS:
TXD………..Transmit data from the
Local or Master
RXD……….Receive Data to the Local
Or Master
EM1………..Data is being sent on
Emitter 1
EM2………..Data is being sent on
Emitter 2
D1…………..Data is being received
On Detector 1
D2…………..Data is being received
On Detector 2
A-STR………Anti-streaming has
Tripped
BAT…………Battery Charge Status
Steady on --- Charging
Slow Blinking --- Trickle
Charge
PWR………………DC power is up