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Fully isolated DIN Rail RS-232 to RS-485 Converters / Line Drivers

The DCP485 is a compact RS-232 to RS-485 converter which features a complete electrical isolation barrier and heavy duty electrical surge protectors. These devices feature a DIN rail mountable enclosure for application to a junction box, a panel, a relay rack, the sides of computer equipment, or anywhere a DIN rail can be mounted. Isolation is provided by optical couplers and a transformer isolated DC-to-DC converter. The RS-232 connection is through male or female EIA 9-pin D-sub connectors, or a 3-wire RS-232 connection can be made through convenient pluggable screw terminals. The RS-485 connections are made through convenient pluggable solderless screw terminals.

The DCP485 series is designed for full duplex operation over two wire pairs. Outputs are tri-state, allowing multidropping of up to 32 units over one pair. Data rates are DC to 115.2 kbits per second. Four diagnostic LED indicators are provided for installation guidance and system troubleshooting. The RS-232 interface includes Request To Send (RTS) and Data Terminal Ready (DTR) either of which can be used via DIP switches to enable the RS-485 transmitter. Alternately, the DCP485 offers automatic line switching in which the RS-485 transmitter is enabled automatically by each character sent on the RS-232 Transmit Data (TD) line. Additionally, the RS-485 transmitter and receiver may be independently enabled continuously or under RS-232 control. A convenient null modem switch is provided for the data lines. Also, line termination switches independently connect line termination and line bias resistors to the RS-485 lines. The units are powered from wide-range voltages of +10 to +30 VDC through pluggable solderless screw terminals.

Circuit diagram Dataforth DCP485

Block Diagram DCP485

PDF Downloads:

  • Produkt Overview DCP/LDM
  • Product Overview DCP/LDM

  • 2 Modules for Type DCP485:

    DCP485-P RS-232 Interface, 9-pol. Connector DCP485 Fully isolated DIN Rail RS-232 to RS-485 Converter / Line Driver
    DCP485-S RS-232 Interface, 9-pol. Connector DCP485 Fully isolated DIN Rail RS-232 to RS-485 Converter / Line Driver


    • Baud Rates up to 115.200 Baud
    • Max. Distance 11.3 km at 2400 Baud
    • Asynchronous 4-wire Full- / 2-wire Half-Duplex, 2-wire Simplex
    • Isolation 1500 Vrms
    • Isolation with Optcoupler and DC-DC Converter
    • Input Protection and 15kV ESD protected
    • LED`s for Installation, Startup and error diagnostics
    • RTS, DTR and Auto RS-485 Transmitter Controll-lines
    • TD and RD Channel-lines
    • Tri-state Output, up to 32 units
    • Choice of different connectors
    • Power Supply +10 to +30VDC
    • Operating Temperature Range -40°C … +60°C
    • Dimensions 109 x 84 x 22.5 mm
    • CE Compliant