Fiber Optic Links

AFL - 220 DIN Rail Fiber Optic Link

AFL - 220 DIN Rail Analog / Contact Closure Fiber Optic Link is an OEM Product designed especially for Industrial Applications. The units may be used for Transferring ±10V Analog Signals or 4 - 20mA Current Loop Signals, together with 2 Contact Closures (or Digital TTL Signals). The User may configure the Analog Input to be -10V to +10V or 4 - 20mA by using a Single Jumper. The Receiver will Output both 4 - 20mA Signal (for Input Range of 0 to +10V or 4 - 20mA, as selected) along with 4 - 20mA Current Loop Signal.

The 2 Digital I/O Lines may be also Configured by the user to 0 to +5V (or +3.3V) Standard TTL signal or to contact closure (i.e. a contact close at the transmitter would cause a contact closure at the receiver). The Receiver Contacts are change-over type so the Operation may be Inverted (Contact Closure at the Input may be configured to Closed or Open Switch at the Receiver).

The AFL - 220 Analog / Contact Closure Fiber Optic Link was designed for System Integrators and Builders, where Low Size, Low Power Consumption and Low Cost are Important. You won't have to keep 3 - 4 different Fiber Optic Links in your toolbox. One Link does it all with few Simple Jumper Configurations.

The Bandwidth of an Analog Input is DC - 5kHz. The Contacts can be switched upto 300 times per second and the TTL Lines can be toggled upto 30,000 times per second. The Distance between 2 Modules may be between 0 to 2 miles with the Standard Multi-mode Interface (30 miles Optional with Single-mode Optical Interface and SM Fiber).

  1. AFL - 220 Block Diagram:
  1. Features:
  2. Excellent Signal Isolation
  3. Prevents Ground Loops and Computer Noise Effects on your Analog Signals.
  4. Transfers Analog Signals to Distances of upto 3km (50km Optional).
  5. Linearity: Better than ±0.05%.
  6. Low Noise S/N Ratio: 72dB.
  7. Input Signal: Upto ±10 Volt @ DC - 5kHz or 4-20mA @ DC - 5kHz.
  8. 2 Contact Closure Signals with 125VAC @ 0.5A or 24VDC @ 1A Rating.
  9. Input Power may be selected by user: 9 - 14V DC or 16 - 28V DC.
  10. Low Offset Temperature Drift: Better than 50ppm/°C
  11. Very Small Size: 22.5mm Width.
  12. Low Cost
  13. Differential Input Option with 1 or 10 or 100 Gain for Low Level Signals and Better Noise Immunity.
  14. Overflow and Underflow Alarm LEDs + Open Collector Signals at the Transmitter.
  15. Out of Range and No Link Alarm LEDs + Open Collector Signals at the Receiver.
  1. Advantages:
  2. Low Noise Transfer of Analog or Digital Data, particularly beneficial in Electrically Noisy Environments and for Transmission over Long Distance.
  3. For Industrial Applications: DIN Rail Interface, 24V Single Supply.
  4. Optional Differential Amplifier Input Stage provides a Differential Input, with Gain of 1 or 10 or 100 (must be configured on time of order), for Direct Connection of any sensor such as: Strain Gage, Piezo, EEG & ECG, Temperature, Humidity, Pressure, etc.
  5. Isolates delicate Test Equipment from Computer generated Noise and Spikes: Noises from Computer do not Return into your System.
  6. Eliminates the formation of “Ground Loops” (when Two Instruments are connected to Separate Power Lines or have a difference between their Ground Voltage Potentials).
  7. Total Protection of Signal Processor's Input Stage from Accidental Sensor Malfunction (e.g. Short to Mains Voltage or a Lightning Shock).
  8. Replaces bulky coaxial cables with compact fiber optic cables - especially important when rewiring existing ducts. Interface to existing fibers - Multi-Mode standard, Single Mode optional.
  9. Transfers Analog Signals to distances of upto 3km - with 12 bits Accuracy.
  1. Technical Specifications:

Input Voltage Range:

±10V or 4-20mA

Output Voltage Range:

±10V or 4-20mA

Non-Linearity Error:

0.05% @ ±10V Range


Better than 1mV RMS

Input Impedance:


Analog Bandwidth:

DC - 5kHz

Digital Bandwidth:

DC - 30kbps

Digital Bandwidth:


Supply Voltage:

9-14V or 16-28V DC

Supply Current:

Rx: 120-180mA; Tx: 90-150mA

Optical budget with Single Mode Transceivers:

30 dB

  1. Power Supplies:

AFL - 220 - BAT:
(Battery Operated Power Supply)

Can run upto 2 Rx or Tx units for upto 10 hours. Includes a 12V / 6.5AH Battery, Charger + Cables. Larger Batteries with Higher Capacity are available.
(Available in OEM version)

Battery Operated Power Supply
Housed in a Metal Case

  1. Rack Mounting (AFL - 220 Rack):

19″ Rack Enclosure: 19″ Rack Enclosure is Available for Housing upto 12 Modules (Rx or Tx),
and a Power Supply or upto 19 Modules with External Power Supply

All Specifications are subject to change without a Prior Notice

For any sort of clarifications kindly contact: