BLACK BOX IC521A-F Async RS-232 to 2 Wire RS485 Interface Converter.

Convert async RS232 to RS485 at speeds up to 115.2 kbps with distances up to 4000 ft. over CATx cables.

Product Features

  • Operates over 2-wire half-duplex asynchronous point-to-point.
  • Data rates up to 115.2Kbps.
  • Up to 4000 feet range.
  • Passes transmit and receive data only.
  • No AC or batteries needed.
  • Operates with or without echo.
  • No RS-232 control signal is needed to turn around the line.
  • Silicon Avalanche Diodes provide 600 watts per wire of protection against harmful data line transient surges.
  • The RS-232 DB25 is fixed DCE (no switch for DTE/DCE).

    • This is a high-speed 2-wire only point-to-point line driver. It gets power from the DTE device to run or from an add on external power supply (PS576).

    General specifications


    Approvals CE, FCC Part 15 Class A
    Clocking None
    Connectors (1) DB25 female and (1) RJ-45 female
    Diagnostics None
    Dimensions 0.7" H x 2.1" W x 2.7" D (1.8 x 5.3 x 6.9 cm)
    Indicators None
    Interface RS-232
    Interface Power Draw Can be supplied by Pin 4 and Pin 20 from the DTE
    Line Type Twisted pair 2-wire
    Modem Data Rate 115.2K
    Number of Drops Supported 32
    Operating Humidity 5 to 95% non-condensing
    Operating Mode Point-to-point
    Operating Temperature 32 to 122° F (0 to +50° C)
    Operation 2-wire half duplex
    Power Can be supplied through Pin 9, or use the PS576
    Weight 2 oz. (56.7 g)


    Will be shipped from Europe by Air Mail International priority mail.

    Thanks for looking

    I will ship Worldwide. PayPal only.