J-9
LDM35 Series
Signal Powered Limited Distance Modem
Model LDM35
$
134
⻬ Signal-Powered: No
Power Source Required
⻬ Optical Isolation: Breaks
Ground Loops
⻬ Heavy Duty Surge
Protectors: Prevents
Lightning Damage
⻬ LED Diagnostic
Indicators: Simplifies
Installation and System
Troubleshooting
⻬ Operation to Two Miles
(3.3 KM) at 9600 Baud,
One-Half Mile (0.8 KM) at
19,200, Seven Miles
(11.7 KM) at 1200 Baud
⻬ Four-Wire Full Duplex,
Two-Wire Simplex
Specifications
Model LDM35
Baud Rate Range 0 – 19.2K
Baud Rate 19.2K 9.6K 4.8K 2.4K 1.2K .6K .3K – 0
Distance (miles) 0.5 2 3 5 7 10 12
Distance (km) 0.8 3.3 5 8.3 11.7 16.7 20
Common Mode
Isolation 500V Surge, 300V Continuous
Differential Mode
Surge Protection
(3 devices) ANSI/IEEE C37.90.1-1989
Channel Lines
(1)
TD, RD
Control Lines
(1)
RTS, CTS, DTR, DSR, RLSD
Modes Asynchronous 4-wire full duplex, 2-wire simplex
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.
The LDM35 Series of products
is designed to allow video display
terminals (VDTs) and other RS-232
devices to be connected over
distances sufficient to cover any
industrial or institutional complex of
buildings. These modems feature a
rugged enclosure small enough to
mount on the back panel of VDT
units, saving valuable desk and
floor space.
The LDM35 Series does not require
a power supply for operation. The
use of low power circuits and a
sensitive optical receiver allows the
devices to derive all necessary
power from the RS-232 data and
control signal.
⻬ Selection of Connectors
⻬ Wide Operating
Temperature Range,
0 to 70°C
⻬ Null Modem Switch
Extended Warranty
Program
SM
RD+ 2
RD- 3
TD+ 4
TD- 5
Modular Phone
Jack Option
Field Connector
RS-232 Connector
Connector C/L
1.85 (47.0)
2.1 (53.3)
Screw Terms
1.65 (41.9)
RD+
RDTD+
TD-
1
2
3
4
000.31
(7.9)
0.53
(13.5)
0.120 (3.0) Dia
3.6 (91.4)
1.0 (25.4)
0.38 (9.6)
0.25 (6.4)
0.50 C/L
(12.7)
Dimensions: Inches (mm)
Connector
Flange Detail
J-10
J
Notes: (2) Ground-benign environmental conditions (no salt atmosphere, <50°C ambient
temperature).
Model LDM35
Power: RS-232 data and control signals, 3.0 mA to 10.0 mA
RS-232 Data ±5 V to ±15 V
RS-232 Control Signals +6 V to +15 V, 3.0 mA to 10.0 mA
Operating Environment 0 to 70°C, 0 to 95% relative humidity, noncondensing
Dimensions 3.6 x 2.1 x 1.3" (91.4 x 53.3 x 25.4 mm)
Weight 90.1g (3.2 oz) max
MTBF
(2)
>150,000 hrs
To Order
(Specify Model Number)
Model No. Price RS232 Connector Field Connector
LDM35-P $134 25 Pin male Screw termination
LDM35-S 134 25 Pin female Screw termination
Includes operator’s manual.
Ordering Example: LDM35-S converter: $
134
.
They are designed for full-duplex,
asynchronous operation over two,
DC-continuity, non-loaded, twistedwire pairs. Two-wire simplex
operation may be accomplished
over two wires. The modem circuits
and, consequently, the host device
are protected from electrical
transients due to lightning strikes
or operation of heavy industrial
equipment.
Each device features a convenient
Data-Communication Equipment
(DCE) to Data-Terminal Equipment
(DTE) switch which reverses pins
2 and 3 of the RS-232 connector.
For installation and troubleshooting,
each unit has diagnostic
Light-Emitting Diodes (LEDs) on the
transmit and receive lines.
The RS-232 connector may be
ordered as a male or female 25-pin
connector. Field connection is made
through a modern, solderless,
screw-termination assembly.
Alternatively, a convenient four-wire
modular phone jack is available.
Power Requirements
Model LDM35 is powered by the
RS-232 data and control signals
from its host computer or terminal
device. It receives power from Data
Terminal Ready, pin 20 or Request
To Send, pin 4, and Transmitted
Data, pin 2. Transmitted data may
be on pin 3 when the DCE/CTE
switch is in the DTE position. For
proper operation, minimum required
signal voltage level is ±6 V at
3.0 mA to 10.0 mA.
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