Model LDM30
Baud Rate Range 0 – 57.6K
Baud Rate 57.6K 38.4K 19.2K 9.6K 4.8K 2.4K 1.2K – 0
Distance (miles) 0.5 0.75 1.0 3 5 7 12
Distance (km) 0.8 1.25 1.7 5 8.3 11.7 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
J-7
LDM30 Series
General Purpose Limited Distance Modem
⻬ DC to 57,600 Baud
⻬ Optical Isolation
⻬ Surge Protectors
⻬ LED Diagnostic
Indicators
⻬ Operation to 3 Miles
(5 KM) at 9600 Baud,
1 Mile (1.7 KM) at 19,200,
0.5 Miles (0.8 KM) at
57,600
⻬ Four-Wire Full Duplex,
Two-Wire Simplex
⻬ Self-Powered or
Host-Powered
⻬ Selection of Connectors
⻬ Wide Operating
Temperature Range,
0 to 70°C
The LDM30 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 aluminum enclosure small
enough to mount on the back panel
Specifications
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.
$
133
Basic Unit
of VDT units, saving valuable desk
and floor space.
The LDM30 Series is designed for
full-duplex, asynchronous operation
over two, DC-continuity, on-loaded,
twisted-wire pairs. Through special
high-speed optically-coupled circuits
they may communicate at data rates
up to 57,600 baud.
Extended Warranty
Program
SM
Model LDM30
Power:
AC operation
(2)
12 Vac at 92 mA
DC operation ±9 Vdc to ±15 Vdc, 35 mA
Operating Environment 0 to 70°C, 0 to 95% relative humidity, noncondensing
Dimensions 3.6 x 2.1 x 1" (91.4 x 53.3 x 25.4 mm)
Weight 100 g (3.5 oz) max
AC Transformer 311.8 g (11.0 oz) max
MTBF
(3)
>150,000 hrs
J-8
J
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)
12
VAC
AC
GND
RD+
RDTD+
TD-
1
2
3
4
5
6
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)
C/L = Center Line
Connector
Flange Detail
Notes: (2) 120 Vac and 220 Vac power transformers are available. (3) Ground-benign
environmental conditions (no salt atmosphere, <50°C ambient temperature).
To Order
(Specify Model Number)
Model RS232 Field Power
Number Price Connector Connector Source
LDM30-P $133 25 Pin male Screw termination Host-powered
LDM30-S 133 25 Pin female Screw termination Host-powered
LDM30-PT 149 25 Pin male Screw termination Transformer
LDM30-ST 149 25 Pin female Screw termination Transformer
Includes operator’s manual.
Transformer powered units also include 120 Vac wall mount transformer.
Ordering Example: LDM30-ST converter: $
149
.
A self-powered model and a hostpowered model are available. The
self-powered unit uses 12 Vac from
a wall-mounted transformer while
the host-powered unit takes ±DC
power from pins 9 and 10 of the
RS-232 connector. 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.
AVAILABLE FOR FAST DELIVERY!
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EPG05
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