Plug & play insulator and converter of RS232 – RS485/422 interfaces.

Auto Direction control: automatically determines and controls the direction of the data transmission on RS485/422 interface.

ISORS485DR B 300px minISO485DR-B provides galvanic insulation between RS232 and RS485/422 interfaces, enabling data exchange in environments with a high level of electromagnetic interference and a potential difference in the ground potentials of the communicating devices.

The converter comes in a box for installation on a 35mm DIN rail and detachable terminals, which makes it easy to install in industrial facilities.

Connection of ISO485DR-B to RS232 is only through three signals: RxD, TxD, GND.

LED indications for data reception at RS232 and RS485/422 side respectively.

At the RS485/422 interface side ISO485DR-B can operate in full duplex or half duplex mode.
In full duplex (RS422) mode at RS485/422 interface side there are separate receiver and transmitter and simultaneous data reception and transmission is possible. The RS422 connection is by 4 or 5 wires.

In half-duplex operation mode, the transceiver is a common at the RS485 side and simultaneous reception and transmission of data is not possible. The RS485 connection is by 2 or 3 wires.


Technical features:

  • Plug & play: no software drivers or manual settings are required.
  • Baud Rate:1200 ÷ 115200 bps, auto detect.
  • Automatic send data control - automatic control of the direction of data transmission on RS485/RS422 interface.
  • Communication protocol: asynchronous transfer, transparent transmission, half duplex, full duplex.
  • Mode of operation: point to point, point to multipoint.
  • Full three-way insulation between power supply and serial interfaces, protecting against equalizing currents.
  • Supply voltage: 230VAC.
  • Consumption: ≤ 3VA.
  • Optical isolation 1500Vrms (AC, 1 min.).
  • 2 LED indicators - for receiving data via RS232 and RS485/RS422 interfaces.
  • Three-wire RS232 connection: TxD, RxD, GND.
  • Cable length for RS232: up to 15m.
  • Cable type for RS 485/422: twisted pair.
  • Wire cross-section: ≤2.5 mm².
  • RS485/422 line length: up to 1200m.
  • Hot-pluggable, detachable terminals.
  • Dimensions 35x110x58 mm with terminals.
  • Operating temperature: +5 ÷ 55°C.
  • Relative humidity: ≤ 95 %.
  • Installation on DIN rail acc. to EN-50022.
  • Protection degree: IP20.


Connecting a device communicating via RS232 to devices supporting RS422/485 communication.
Galvanic separation of communication segments.
Control and information systems for technological processes and installations.
Systems for data collection and processing, industrial control systems.
With measurement devices for utility applications.
Motor drives for industrial use.
Automated HVAC systems.
Management of petrol stations, etc.

The solutions for your automation ideas.

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