DCP485-S: Fully Isolated DIN Rail RS-232 To RS-485 Converter/Line Driver

Fully Isolated DIN Rail RS-232 To RS-485 Converter/Line Driver

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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 115.2K bits per second (baud). 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 +30VDC through pluggable solderless screw terminals.


  • Complete Isolation with Optical Couplers and Transformer-Coupled DC-to-DC Converter
  • Industrial Surge Protection Devices and 15kV ESD Protected RS-232 Inherent
  • Four LED Diagnostic Indicators
  • 38.4K bps (baud) at 1 Mile (1.6km), 115.2K bps (baud) at 0.8 Mile (1.3km)
  • RTS, DTR, or Auto RS-485 Transmitter Control
  • Tri-state Outputs for Multidrop Applications, up to 32 Devices
  • Selection of Connectors
  • Wide Operating Temperature Range
  • Pluggable Solderless Screw Terminal Field Connections
  • CE Compliant

Block Diagram


Frequently Asked Questions

I’m having trouble getting the DCP35 to communicate with a datalogger.
I’m having trouble getting the DCP35 to communicate with a datalogger. To connect to the DCP35, open or download the DCP35 data sheet from the Media Attachments box to the right of this Content box or the DCP35 User Manual from the Media Attachments box to the right of this Content box.
The important aspect of the DCP35 is providing it with sufficient power for it to send data over usable distances at a reasonable data rate.
That said, pay special attention to the power specifications in the data sheet and to the “Power Requirements” and “Cable Capacitance Effects On Distances” sections of the user manual.
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