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:

Interface Glass Fiber-Bus ST <> Profibus

  • Interface Glass Fiber-Bus ST <> Profibus


  • RS485 interface with Profibus pinout
  • Baud rate up to 1.5 Mbaud
  • Electrical isolation to almost any extent between the connected devices
  • Noise-immune and secure transmission over a distance of up to 3800 meters per segment
  • Extended supply voltage range up to 24V
  • Shipped optionally with or without power supply:
    Please order power supplies as separate accessories.
  • No re-configuration of transmission parameters required
  • Housing suitable for installation on top hat rails
  • 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

Background information:

For data transmission across long distances and/or in extremely interfering environments, we strongly recommend the use of fiber-optic cables. Easily installed connections over relatively short distances up to 100 m are made possible by the use of plastic optical fiber cables, whereas for a distance segment of up to 3800 m, the use of fiber-optic lines is made necessary. The attenuation of the light in fiber-optic lines is considerably lower than that in plastic optical fiber cables.

While, in the past, the installation and preparation of fiber-optic lines was rather difficult, many suppliers now offer a comprehensive service of installation and customizing of cables, due to the fact that fiber-optic technology is now increasingly applied in commercial networks.

Technical data

  • Operating mode:
    • RS485 2-wire mode with echo suppression and
    • automatic control of the RS485 transceivers
  • Switching time:
    • approx. 1µs for switching from data send to receive
    • (can be changed on request)
  • Baud rate:
    • 0..1.5 Mbaud
  • Data format:
    • any format
  • Transmitted signals:
    • RxD-P/TxD-P, RxD-N/TxD-N
  • Supported topologies:
    • Bus and star, but no ring structures
  • Cascadability:
    • 5 Adapter @93.75 KBaud, 32 Adapter @19.2 KBaud
  • Serial connection:
    • 9-pin SUB-D socket
  • Glass fiber connection:
    • ST plug adapter
    • SMA plug adapter on request
  • Fiber-optic medium:
    • Duplex multimode fiber-optic cable
    • 50/125um, 62.5/125um
    • 200/230um PCS fibers on request
  • Max. distance:
    • 50/125um: typically 3200m, min. 1400m @3dB/km
    • 62.5/125um: typically 3800m, min. 2200m @3.5dB/km
  • Optical budget:
    • 50/125um: typically 9.6dB, min. 4.2dB
    • 62.5/125um: typically 13.4dB, min. 8.0dB
  • Wavelength:
    • 820 nm
  • Galvanic isolation:
    • Isolation voltage min. 1 KV DC between
    • between supply and serial connection
  • Power supply:
    • 12..24V DC/AC
  • Current consumption:
    • max. 150 mA at 12 V input voltage
  • Supply voltage connection:
    • Plug-in screw terminal, 5.08mm spacing
    • Labeled "L+" and "M"
  • Ambient temperature:
    • Storage: -40..+70°C
    • Operating in non-rowed installation: 0..+60°C
    • Operating in rowed installation 0..+50°C
  • Permissible relative humidity:
    • 0..95% RH (non-condensing)
  • Housing:
    • Plastic small housing, 105x75x45mm
  • Weight:
    • approx. 100 g
  • Scope of delivery:
    • 1x Interface Glass Fiber-Bus ST <> Profibus