ST fiber-optic line  20mA interface

ST fiber-optic line 20mA interface

Connect 20mA devices over long distances


ST fiber-optic line RS232 interface

Connection of control device to PC by means of fiber-optic cable

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.


Product properties:

  • Transmission of two data channels
  • Electrical isolation to almost any extent between the connected devices
  • Disruption-free and secure transmission across distances of up to 3800 m
  • 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
  • Top hat rail housing according to DIN EN 50022-35
  • Conforms to standards both in office and industrial environments:
    • Increased noise immunity for industrial areas
    • Stricter noise emission for residential and commercial areas


Baud rate:    0..19,200 baud
Data format:   any format
Transmitted signals:   RxD, TxD
Serial connection:   9-pin SUB-D adapter
Glass fiber connection:   ST plug adapter
SMA plug adapter on request
Fiber-optic medium:   Duplex multimode fiber-optic cable
max. distance:   50/125um: typically 3200m, min. 1400m @3dB/km
62.5/125um: typically 3800m, min. 2200m @3.5dB/km
200um PCS fiber: typically 2500m, min. 1500m @8dB/km
Optical budget:   50/125um: typically 9.6dB, min. 4.2dB
62.5/125um: typically 13.4dB, min. 8.0dB
200um PCS fiber: typically 20dB, min 12dB
Wavelength:   820 nm
Galvanic isolation:   Isolation voltage min. 1 KV DC
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 compact housing, 105x75x22mm
Weight:   approx. 100 g
Delivery:   1 x ST fiber-optic line 20mA interface

Please order power supplies
separately as accessories




Send messages - when limits are violated or timer-based - for informational purposes directly to the responsible technical as an e-mail or as a reroute via SMS.


After the device has been configured for and connected to your network, the following steps are still necessary.

Open the profile for configuring e-mail alarm messages. e-57606-35-pide-000
Enter the desired parameters. e-57606-36-pide-000
When the limit you have set is exceeded, the device sends an e-mail which can also be transmitted as an SMS message using special functions available from cellular phone service providers. e-57606-37-piww-000