Wiesemann & Theis GmbH

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

Data sheet:

RS422/RS485 interface module

for old ISA cards and Com-Servers with BNC

  • Interface module 18803

Freely selectable serial interface

W&T interface modules equip devices having only a serial TTL interface with almost any desired standard interface type. In addition the modules allow you to adapt the interface types of many W&T devices over a wide range. The modification is done by simply replacing the standard interface modules with modules of the desired interface type.



  • 1 x serial standard interface
    • 9-pin SUB-D connector
  • 1 x TTL interface
    • 12-pin male header with 2mm spacing

Management and connectivity:

  • Tiny plug-in interfaces
  • Interface
    • RS485/RS422

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:

  • TTL plug adapter:
    • Terminal strip, 2mm spacing
  • Serial port:
    • 9-pin SUB-D adapter
  • Operating modes:
    • RS422
    • RS485 2/4 wire with handshake control
    • RS485 2/4 wire with automatic control
  • Switching time:
    • approx. 10µs for switching from data send to receive
    • for RS485 automatic control (can be changed on request)
  • Transfer rate:
    • max. 10MBaud
  • Signals:
    • RxD,TxD,CTS,DTR
  • Termination:
    • Connectable termination network
  • Power supply:
    • 5V, 40mA (typ.)

Dimensions and other data

  • Dimensions:
    • 45 x 32 x 14mm (L x W x H)
  • Enclosure rating:
    • IP00
  • Weight:
    • approx. 15g