20mA <> ST fiber-optic line interface

Connect TTY over glass fiber optics

The model 41210 Interface transmits serial 20mA data via multi-mode glass fibers over a distance of up to 3800 meters. The current loop interface can be operated active or passive and the mode settable independently for each of the two loops.

Connections and displays:

• Serial port:
  • 20mA interface
  • 9-pin SUB-D adapter
• Glass fiber optics port:
  • ST plug adapter
• Baud rate:
  • 0..19,200 baud
• Data format:
  • any format
• Supported signals:
  • RxD, TxD
• Fiber-optic medium:
  • Multi-mode fiber 50/125μm, 62.5/125μm
• Wavelength:
  • 820nm
• Optical budget:
  • 50/125µm: typically 9.6dB, min. 4.2dB
  • 62.5/125µm: typically 13.4dB, min. 8.0dB
• Maximum distance:
  • 50/125µm: typically 3200m, min. 1400m @3dB/km
  • 62.5/125µm: typically 3800m, min. 2200m @3.5dB/km
• Galvanic isolation:
  • Isolation voltage min. 1kV DC between supply and serial connection
• Supply voltage:
  • 12..24V AC/DC
• Current consumption:
  • typ. 90mA @12V DC, 45mA @24V DC
• Supply connection:
  • Plug-in screw terminal, 5.08mm spacing
  • Labeled "L+" and "M"
• Displays:
  • 1x LED Data
  • 1x LED Power

Housing and other data:

• Housing:
  • Plastic housing for top hat rail installation
  • 105 x 22 x 75mm (L x W x H)
• Enclosure rating:
  • IP20
• Weight:
  • approx. 100g
• Ambient temperature:
  • Storage: -40..+70°C
  • Operating in non-rowed installation: 0..+60°C
  • Operating in rowed installation 0..+50°C
• Permissible relative humidity:
  • 5..95% RH (non-condensing)
• MTBF:
  • 572,955h @25°C per MIL-HDBK-217
• Life expectancy:
  • > 25 years at 25°C ambient temperature
• Scope of delivery:
  • ST fiber-optic line <> 20mA interface
  • Please order power supplies separately as accessories

Data transmission over long distances and in extremely noisy environments make the use of fiber optics the logical choice as a physical transmission medium.

The use of plastic fiber optics allows easy-to-install connections over relative short distances of up to 100 meters. But for distances above this limit the use of glass fiber optic cable is unavoidable.

While distances of up to 4km are easily accomplished with multimode fiber optics, greater distances are the domain of singlemode fiber optics.

It used to be that routing and assembling glass fiber optics created significant problems for the users, but today - thanks to the wider use of glass fiber technology in networking - many companies are offering this work as a service.

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