General Purpose Limited Distance Modem

LDM30 Series

PLACE ORDER

DC to 57,600 Baud
Optical Isolation
Surge Protectors
LED Diagnostic Indicators
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
Four-Wire Full Duplex, Two-Wire Simplex
Self-Powered or Host-Powered
Selection of Connectors
Wide Operating Temperature Range, 0 to +70°C

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Description

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.

Place Order(Specify Model Number)

Part Number/ Desc.

Qty

Description

LDM30-P

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Availability:

General purpose limited distance modem, 25 pin male RS-232 connector, screw termination field connector, host-powered

LDM30-S

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Availability:

General purpose limited distance modem, 25 pin female RS-232 connector, screw termination field connector, host-powered

LDM30-PJ

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Availability:

General purpose limited distance modem, 25 pin male RS-232 connector, modular phone jack field connector, host-powered

LDM30-SJ

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Availability:

General purpose limited distance modem, 25 pin female RS-232 connector, modular phone jack field connector, host-powered

LDM30-PT

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Availability:

General purpose limited distance modem, 25 pin male RS-232 connector, screw termination field connector, transformer powered

LDM30-ST

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Availability:

General purpose limited distance modem, 25 pin female RS-232 connector, screw termination field connector, transformer powered

LDM30-PJT

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Availability:

General purpose limited distance modem, 25 pin male RS-232 connector, modular phone jack field connector, transformer powered

LDM30-SJT

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Availability:

General purpose limited distance modem, 25 pin female RS-232 connector, modular phone jack field connector, transformer powered

† All amounts shown in EUR, GBP, or USD
Note: Includes operator’s manual. Transformer powered units also include 120 Vac wall mount transformer.