W&T connects
Interfaces for TCP/IP, Ethernet, RS-232, RS-485, USB, 20mA, glass and plastic fiber optic cable, http, SNMP, OPC, Modbus TCP, I/O digital, I/O analog, ISA, PCI
Data sheet:

RS232 <> 20mA interface, compact version

Serial Interface - galvanically isolated in a dongle housing

The Interface connects devices equipped with an RS232 port to active and passive 20mA components with minimal space requirements.



  • 1 x RS232
    • 25-pin Sub-D plug
  • 1x 20mA
    • 25-pin Sub-D socket
    • Alternate designations: Current loop, TTY, line current interface

Management and Connectivity:

  • Galvanic isolation with 1kV isolation in passive mode
  • Active/passive mode for transmission and reception loop, individually adjustable
  • No re-configuration of transmission parameters required
  • Handy adapter solution

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

Technical data

Connections and displays:

  • Serial Port A:
    • RS232 Interface
    • 25-pin SUB-D plug, DTE assignment
  • Serial Port B:
    • 20mA interface
    • 25-pin SUB-D socket
  • Baud rate:
    • 0 to 19200 Baud
  • Data format:
    • any format
  • Supported signals:
    • RxD, TxD
  • Galvanic isolation:
    • min. 1kV in passive mode
  • Power supply:
    • Supplied power adapter
  • Current consumption:
    • approx. 50mA (passive), approx. 90mA (active)

Housing and other data:

  • Housing:
    • DB25 dual housing, 63 x 54 x 16mm (L x W x H)
  • Weight:
    • approx. 150g incl. power adapter
  • Scope of delivery:
    • RS232 <> 20mA interface, compact
    • AC adapter for office use (only with Euro plug)
    • Gender Changer 25-pin female/female
    • The 11574 adapter cable for connecting the Interface to
    • 9-pin terminals is provided at no cost.
    • Please specify in your order.


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

    • 9-pin adapter cable for compact converters
    • 11574
    • 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.