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Signal Powered Fiber Optic Converters

LDM80 image

The LDM80 is a small, inexpensive fiber optic transmitter/receiver completely powered by the host RS-232 port. The enclosure for the LDM80 is a conductive shell which greatly reduces RF radiation and susceptibility. The rugged metal enclosure is small enough to mount on the back panel of typical computer equipment saving valuable desk and floor space. A pair of these units allows most RS-232C cable links to be replaced and extended with a duplex fiber optic cable. The normal 50-foot (15m) RS-232 limit may be extended to 2.2 miles (3.5 km). Fiber optic data communications provide complete EMI/RFI rejec-tion, isolation, elimination of ground loops, and reduced error rates. Data security is enhanced by almost nonexistent electromagnetic emissions. The RS-232 connection is through male or female EIA 25-pin connectors. The fiber optic connection is through ST connectors.

The LDM80 is equivalent to a 3-wire, full duplex, RS-232 circuit. Handshake signals are locally connected. Indicating LEDs come on during a "SPACE" on transmit or receive data. A TD/RD reversing DIP switch is provided for connection to DTE (Data Terminal Equipment) or DCE (Data Communication Equipment) ports.

Circuit diagram Dataforth LDM80

Block Diagram LDM80

PDF Downloads:

  • Produkt Overview LDM
  • Product Overview LDM

  • 2 Modules for Type LDM80:

    LDM80-P-025 RS-232 Interface, Connector LDM80 Signal Powered Fiber Optic Converter
    LDM80-S-025 RS-232 Interface, Connector LDM80 Signal Powered Fiber Optic Converter


    • Baud rates up to 19.200 Baud
    • Max. Distance 3.5 km at 19200 Baud
    • Asynchronous 2-Fiber Full-Duplex, 1-Fiber Simplex
    • Isolation through Fiber-Optic cable
    • DCE/DTE Switch
    • Connetion over RS-232 connector
    • LED`s for Installation, Startup and error diagnostics
    • RTS, ,CTS, DTR, DTS and RLSD-Controll-Lines
    • TD and RD Channel-lines
    • Power Supply by RS-232 Host PC
    • Power Supply +5 bis +8,5 VDC
    • Operating Temperature Range -20°C … +70°C
    • Dimensions 90.7 x 53.3 x 18.8 mm
    • Designed for FCC Class A
    • Designed for FCC Class A
    • CE Compliant
    • Special Solutions on request