Fully Isolated Limited Distance Modem |
| LDM70 Series |
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Fully Isolated Limited Distance Modem
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DC to 57,600 Baud
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Complete Isolation with
Optical Couplers and
Power DC-to-DC
Converter
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Data Terminal Ready,
Carrier Detect
Handshake Without Extra
Wires
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Surge Protectors
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Four 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 LDM70 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 LDM70 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
handshake operation is
implemented over the same two-wire pairs. 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. In
addition, LEDs indicate valid carrier
detect and data terminal ready.
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:Fully Isolated Limited Distance Modem
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