General Purpose Limited Distance Modem |
| LDM30 Series |
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General Purpose Limited Distance Modem
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DC to 57,600 Baud
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Optical Isolation
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Surge Protectors
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LED Diagnostic
Indicators
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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
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Four-Wire Full Duplex,
Two-Wire Simplex
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Self-Powered or
Host-Powered
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Selection of Connectors
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Wide Operating
Temperature Range,
0 to +70°C
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View related products - Communication Products and Converters
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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 of VDT units, saving valuable desk
and floor space.
The LDM30 Series is designed for
full-duplex, asynchronous operation
over two, DC-continuity,
non-loaded, twisted-wire pairs.
Through special high-speed
optically-coupled circuits they may communicate at data rates up to
57,600 baud. A self-powered model
and a host-powered 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.
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† Price are shown in RMB.
Note: Includes operator’s manual. Transformer powered units also include 120 Vac wall mount
transformer.
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Keywords:General Purpose Limited Distance Modem
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