LDM Heavy Duty Modular Converters / Line Drivers

  • Extend communication distances for computers, terminals, and other devices in hazardous industrial and institutional environments
  • Connect RS-232 devices to RS-422 and RS-485 devices
  • 5 models communicate over distances up to 12 miles (19.3km) using continuous dedicated wire pairs and standard RS-232, RS-422, or RS-485 protocols (LDM30/35/70/422/485)
  • 2 models feature fiber optic data links for total electrical isolation and operation up to 2.2 miles (3.5km) (LDM80/85)
Data communications in industrial and institutional environments can present special problems. Lines must be run over long distances, often ranging from thousands of feet to several miles, indoors and outdoors and from building to building. Such data communication systems must be able to function in the presence of electrical transients and noise, ground loops, power surges, and nearby lightning strikes. Our heavy duty industrial data communication products "harden" and protect these systems and can extend data communication networks for many miles without expensive cabling.

All Data Communication Products: Side-by-side specifications comparison

Model Description Max Data Rate Max Distance Notes
LDM Line Driver and Converter Selection
LDM30
General Purpose RS-232 Line Driver
57.6kbps at 0.5 miles (0.8 km)
12 miles (19.3 km) at 1.2kbps
Low cost
LDM35
Signal Powered RS-232 Line Driver
19.2kbps at 0.5 miles (0.8 km)
7 miles (11.3 km) at 1.2kbps
Port-signal powered
LDM70
Fully Isolated RS-232 Line Driver
57.6kbps at 0.5 miles (0.8 km)
12 miles (19.3 km) at 1.2kbps
Full isolation, DTR/RLSD handshake
LDM422 Fully Isolated RS-232/422 Converter 19.2kbps at 1 mile (1.6 km) 7 miles (11.3 km) at 1.2kbps Multidrop capable
RTS/CTS handshake
or 2nd data channel
LDM485 Fully Isolated RS-232/485 Converter 57.6kbps at 0.5 miles (0.8 km) 8 miles (12.9 km) at 1.2kbps Multidrop capable
RTS/CTS handshake
or 2nd data channel
LDM80
Signal Powered Fiber Optic Converter 19.2kbps at 2.2 miles (3.5 km) 2.2 miles (3.5 km) at 19.2kbps Total electrical isolation, intrinsic safety
LDM85 Fiber Optic Converter 5M - 2.5Mbps NRZ TTL (100kbps RS-232/422) at 1.2 miles (2 km) 1.2 miles (2 km) at max data rate Multipoint optical loop, total electrical isolation
DCP DIN Rail Mount Converter and Line Driver Selection
DCP485 Fully Isolated DIN Rail RS-232 to RS-485 Converter/Line Driver 115.2kbps at 0.8 miles (1.3 km) 7 miles (11.3 km) at 1.2kbps DIN rail mounting, auto RS-485 line control
DCP35 DIN Rail Dual Port Signal-Powered RS-232 Line Driver 19.2kbps at 0.5 miles (0.8 km)
7 miles (11.3 km) at 1.2kbps
DIN rail

LDM Heavy Duty Line Driver and Converter Product Family

Part Number Datasheet Description
General Purpose RS-232 Line Driver
Signal Powered RS-232 Line Driver
Fully Isolated RS-232 Line Driver
Fully Isolated RS-232/422 Converter
Fully Isolated RS-232/485 Converter
Signal Powered Fiber Optic Converter
Fiber Optic Converter