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J-17
⻬ Data Rates to 19.2K
Baud at 2.2 Miles
(3.5KM)
⻬ 17dB Optical Link
Power Budget
⻬ Powered by RS-232
Host Port Signals
⻬ Full Duplex
Asynchronous
Operation
⻬ Indicating LEDs
⻬ DCE/DTE Switch
⻬ Designed for FCC
Class A Requirements
⻬ Complies with FCC
Class A Requirements
⻬ Pinned or Socketed
RS-232 Connectors
LDM80 Signal Powered Fiber Optic Modem
The LDM80 is a small,
inexpensive fiber optic
transmitter/receiver completely
powered by the host
RS-232 port. The enclosure for
the LDM80 is a conductive shell
which greatly reduces RF
radiation and susceptibility. The
rugged metal enclosure is small
enough to mount on the back
panel of typical computer
equipment saving valuable desk
and floor space. A pair of these
units allows most RS-232C cable
links to be replaced and
extended with a duplex fiber
optic cable. The normal 50-foot
RS-232 limit may be extended to
2.2 miles (3.5 km). Fiber optic
data communications provide
complete EMI/RFI rejection,
isolation, elimination of ground
loops, and reduced error rates.
Data security is enhanced by
almost nonexistent
electromagnetic emissions.
Specifications
Model LDM80
Baud Rate Range 0 – 19.2K
Distance: Over Baud Rate Range
Fiber Core Diameter (µm) Max. Cable Length (km) Loss Budget (dB)
100 (glass) 3.5 17
50 (glass) 2.5 9
62.5 (glass) 2.0 11
85 (glass) 3.5 16
200 (glass) 3.5 23
1000 (plastic) 30 meters 32
Channel Lines
(1)
TD, RD
Control Lines
(1)
RTS, CTS, DSR, DTR, RLSD
Modes Asynchronous 2-fiber full duplex, 1-fiber
simplex
Optical Transmitter 850 nm wavelength
Output from 1 m cable -26dB typ, -27dB min, -18dB max
Optical Receiver Power
Input for 4 µs Pulse -44dB min
Distortion
Optical Connectors ST
The RS-232 connection is
through male or female EIA
25-pin connectors. The fiber
optic connection is through ST
connectors. The LDM80 is
equivalent to a 3-wire, full
duplex, RS-232 circuit.
Handshake signals are locally
connected as in Figure 1.
Notes: (1) TD = Transmit Data, RD = Receive Data, RTS = Request To Send, CTS =
Clear To Send. DTR = Data Terminal Ready, DSR = Data Set Ready, RLSD = Received Line
Signal Detect.
$
195
Basic Unit
Extended Warranty
Program
SM
Indicating LEDs come on during
a "SPACE" on transmit or receive
data. A TD/RD reversing DIP
switch is provided for connection
to DTE (Data Terminal
Equipment) or DCE (Data
Communication Equipment)
ports.
Recommended Cables
The LDM80 optical transmitter
may be used with a wide range
of fiber sizes. Specifications are
for 100/140µm. Other fiber sizes
may be used with a resulting
different cable loss budget.
LDM80-P-025, $195, Shown
smaller than actual size
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14
1
13
25
Sockets
25
13
1
14
Pins
1.88 (47.8)
1.75 (44.5)
-0.1 (-2.54)
-0.219 (-5.56)
T
TR
R
LEDs
1.42
(36)
2.17
(55.1)
3.51
(89.2)
0
1.65 (42)
0.382
(9.7)
0.729
(18.5)
0
Dimensions: Inches (mm)
0
0.26
(6.6)
To Order
(Specify Model Number)
Model No. Price RS232 Connector Field Connector
LDM80-P-025 195 25 Pin male ST fiber optic connector
LDM80-S-025 195 25 Pin female ST fiber optic connector
Includes operator’s manual.
OMEGACARESMextended warranty is available for models shown on this page.
Ask your sales representative for full details when placing order.
Ordering Example: LDM80-P-025 converter, OMEGACARESM1year warranty for LDM80-P-025
(adds 1 year to standard 1 year warranty), $195 + 28 = $223.
Notes: (1) Ground-benign environmental conditions (no salt atmosphere, <50°C ambient temperature).
Model LDM80
RS-232 Output Voltage +5V logic 0, -5V logic 1 with 3kW Load
DCE/DTE Switch One
Diagnostic LEDs Two
Power:
Port Power +5.0 to +8.5VDC, no current limit, 5mA
and/or DC operation >+8.5 VDC, 10mA current limit
Operating Environment -20 to +70°C, 0 to 95% relative humidity, non-condensing
Dimensions 3.51" x 1.88" x 0.729" (89.2 x 47.8 x 18.5 mm)
Weight 8.1 oz (230 g) max
MTBF
(1)
>100,000 hrs
J
AVAILABLE FOR FAST DELIVERY!
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