Fully Isolated Limited Distance Modem

LDM70 Series

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DC to 57,600 Baud
Complete Isolation with Optical Couplers and Power DC-to-DC Converter
Data Terminal Ready, Carrier Detect Handshake Without Extra Wires
Surge Protectors
Four 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
Wide Operating Temperature Range: 0 to +70°C

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The LDM70 Series of products is designed to allow RS-232 devices to be connected over distances sufficient to cover any industrial or institutional complex of buildings.

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 connection is through a 25-pin D sockect. Field connection is made through a modern, solderless, screw-termination assembly.

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LDM70-S

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Fully isolated limited distance modem with 25 pin female RS-232 connector, screw termination field connector, host-powered

LDM70-ST

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Fully isolated limited distance modem with 25 pin female RS-232 connector, screw termination field connector, transformer powered

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Notez: Includes operator’s manual. Transformer powered units also include ac wall mount transformer.