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W&T Interfaces
for TCP/IP, Ethernet, RS-232, RS-485, USB, 20mA,
Glass and plastic fiber optic cabled, http, SNMP, OPC, Modbus TCP, I/O digital, I/O analog, ISA, PCI

 Additional links: Manual

Data sheet:

RS232 isolator, 4 kV

Article number: 88004

  • 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.

Properties:Show more


  • 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 for industrial environments
    • Low noise emission for residential and business areas
  • 5 year guarantee
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Worth knowing:Show more

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:Show more

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
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Order now:Show more

  Prod. no. in EUR plus VAT
for commercial users
Unit price *
RS232 isolator, 4 kV 88004 110.95 order now
Optional accessories:
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.