Analog Fiber Optic Link AFL-220 AFL-220 Analog Fiber Optic Link
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DIN rail fiber optic link
(picture shown with Single Mode Optics)

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 4-20 mA by using a single jumper. The receiver will output both - 4-20 mA signal (for input range of 0 to +10V or 4-20mA, as selected) along with 4-20 mA 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 the analog input is DC-5KHz. The contacts can be switched up to 300 times per second and the TTL lines can be toggled up to 30,000 times per second. The distance between the 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).

AFL-220 Block Diagram

point   Excellent signal isolation.
point   Prevents ground loops and computer noise effects on your Analog Signals.
point   Transfers analog signals to distances of up to 3Km (50Km. Optional).
point   Linearity: better than +/-0.05%.
point   Low noise; S/N ratio: 72 dB.
point   Input signal: Up to ±10 Volt @ DC-5 KHz or 4-20mA @ DC-5KHz.
point   2 Contact Closure signals with 125VAC@0.5A or 24VDC@1A rating.
point   Input power may be selected by user: 9-14VDC or 16-28VDC.
point   Low Offset Temperature Drift: Better than 50 ppm/deg.C

point   Very small size: 22.5 mm width
point   Low cost - Starting from US$639.- per pair (Rx + Tx)
point   Differential input Option with 1 or 10 or 100 gain for low level signals and better noise immunity.
point  OverFlow and Underflow Alarm LEDs + Open Collector signals at the transmitter
point  Out of Range and No Link alarm LEDs + Open Collector signals at the receiver.


Analog Bandwidth: DC-5KHz.
Digital Bandwidth: DC-30Kbps
Digital Bandwidth: 72dB
Supply Voltage: 9V-14V or 16V-28V DC
Supply current: RX: 120-180mA, TX:90-150mA
Analog Input Range: +/-10V or 4-20mA
Output Voltage Range: +/-10V and 4-20mA
Non-Linearity Error: 0.05% @+/-10V range
Noise: Better than 1mV RMS
Input Impedance: 100KOhms

Optical budget with Single Mode transceivers: 30 dB

point   Low noise transfer of analog or digital data , particularly beneficial in electrically noisy environments and for transmission over long distance.
point  For industrial applications: DIN rail interface, 24V single supply.
point  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.
point  Isolates delicate test equipment from computer-generated noise and spikes: noises from computer do not return into your system.
point  Eliminates the formation of "ground loops" (when two instruments are connected to separate power lines or have a difference between their ground voltage potentials).
point  Total protection of signal processor's input stage from accidental sensor malfunction (e.g. short to mains voltage or a lightning shock).
point  Replaces bulky coaxial cables with compact fiber optic cables - especially important when rewiring existing ducts.
point   Interface to existing fibers - Multi-Mode standard, SIngle Mode optional.
point  Transfers analog signals to distances of up to 3km - with 12 bits accuracy.


Battery operated power supply:
Can run up to 2 Rx or Tx units for up to 10 hours.
Includes a 12 V/ 6.5 AH battery, charger + cables.
Larger batteries with higher capacity are available.
Available in OEM version:

Battery + Charger OEM

Or housed in metal case:
Battery + Charger metal case

19" rack enclosure

19" rack enclosure is available for housing up to 12 modules (Rx or Tx) and a power supply or up to 19 modules with external power supply.

AFL-220 Rack



For more information about other Analog/Digital fiber optic links click here.

Analog Fiber Optic Links

Download Datasheet Download PDF file


A.A. Lab-Systems
Head Office: 33 Hayetzira St., Ramat-Gan 52521, ISRAEL.Tel: 972-3-5756327, Fax: 972-3-5756326
USA office: 9 Blossom drive, Kennett Square, PA19348.  Tel: (302)478-2881 Fax: (610)444-5544
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