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General Purpose Limited Distance Modem

Item# LDM30-P

General Purpose Limited Distance Modem General Purpose Limited Distance Modem
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.
LDM30-P
  • 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
Connection Type
Power Source Type
Quantity Price each
1-4 $172.20
5-9 $163.59
10-24 $160.15
25-49 $153.26
50-99 $149.81
100+ $146.37

In stock

Lead Time ( If not in Stock): 6 weeks

Product Specs

  • Baud Rate 0 – 57.6K
  • Maximum Ambient Humidity 95% RH
  • Maximum Ambient Temperature 70 {C}
  • Minimum Ambient Humidity 0% RH
  • Minimum Ambient Temperature 0 {C}
  • MTBF >150

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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