Wiesemann & Theis GmbH

Networking, sensors and interface technology for industry, office and IT

Data sheet:

RS232 isolator, 4 kV

  • RS232 isolator, 4 kV

Data and control lines galvanically isolated

The Isolator in the compact dongle housing provides galvanic isolation between two RS232 devices with an isolation voltage of 4kV DC and also supports another four handshake signals in addition to the data lines.



  • 2x RS232 ports
    • 25-pin SUB-D plug, DCE assignment
    • 25-pin SUB-D socket, DTE assignment
  • Galvanic isolation between the ports
    • Isolation voltage 4kV DC

Management and Connectivity:

  • Secure RS232 transmission over medium distances
  • Simple to use, true plug-and-play
  • No re-configuration of transmission parameters required

Power supply:

  • No additional power source required

Standards & more

  • Conforms to standards both in office and industrial environments:
    • High noise resistance per EN 61000-6-2
    • Low noise emission per EN 55032:2015 + A1 Cl. B, EN 61000-3-2 & EN 61000-3-3
  • 5 year guarantee

Worth knowing

Elimination of interference:
The use of isolators in data lines eliminates the effects of interference to which the PC is otherwise subjected through its data cables (ground loops, antenna effects, potential differences), remote lightning strikes).

Electrical isolators are not to be confused with surge protectors that are often incorrectly marketed for the same purpose: Surge protectors have no effect on equalizing currents that exist between the connected devices due to the potential differences, and they cannot prevent damage to interface components by such currents.

Technical data

Connections and displays:

  • Serial Port A:
    • RS232 Interface
    • 25-pin SUB-D plug, DCE assignment
  • Serial Port B:
    • RS232 Interface
    • 25-pin SUB-D socket, DTE assignment
  • Air gaps and  creepage distances: creepage distances:
    • > 7mm
  • Baud rate:
    • 0..115,200 baud
  • Data format:
    • any format
  • Galvanic isolation:
    • min. 4kV DC
  • Supported signals:
    • RxD, TxD, RTS, CTS, DSR, DTR
  • Supply voltage:
    • through the RS232 signals
  • Required static current:
    • approx. 5mA @ 8V

Housing and other data:

  • Housing:
    • Plastic small housing
    • 63x54x16mm (L x W x H)
  • Weight:
    • approx. 50g
  • Ambient temperature:
    • Storage: -40..+70°C
    • Operation: 0..+50°C
  • Relative humidity:
    • 5..95% RH (non-condensing)
  • Scope of delivery:
    • RS232 isolator, 4 kV
    • 25-pin Gender Changer female/female


*Net unit price for
commercial users
  • Cable and Connector Accessories

    • 9-pin adapter set for isolators
    • 11573
    • optional

* Our offering is intended only for commercial users. We will be happy to refer private end customers to trading partners through whom our products can be purchased.