Analog Fiber Optic Link AFL-284 AFL-284 Analog Fiber Optic Link
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4 Channels DIN rail fiber optic link
(Product shown with Multi Mode Optics)

AFL-284 DIN rail Analog/Contact Closure Fiber Optic Link is an OEM product designed especially for industrial applications.

The units may be used for transferring 4 analog signals of+/-10V or 4-20mA current loop signals, together with 8 contact closures (or digital/TTL signals).
Each one of the Analog signals can be configured separately to be +/-10V or 4-20mA
Digital Inputs can be optionally adjusted
to 0-12V or 0-24V logic levels.
Each one of the Digital outputs can be adjusted to Logic Input or to Contact Closures.
The user may configure the Analog input to be -10V to +10V or 4-20 mA by using jumpers (Per Channel). The receiver will output both - Voltage or 4-20 mA signals (for input range of 0 to +10V or 4-20mA, as selected) along with 4-20 mA current loop signal.

The 8 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 closure at the transmitter would cause a contact closure at the receiver).
It is possible to invert all of the contact closures using a single jumper (i.e. an open contact would yield a closed contact at the receiver end and vice versa). Same option is available for TTL signal: 1-> 0 and 0->1.

The AFL-284 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.
No need to lay few fibers - One fiber would transfer all signals.

The bandwidth of the analog inputs is DC-7KHz. The contacts can be switched up to 50 times per second and the TTL lines can be toggled up to 20,000 times per second. The distance between the Tx and Rx modules may be between 0 to 2 miles with the standard Multi-Mode interface(30 miles optional with 1550nm Single Mode optical interface and SM fiber).

AFL-284 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: 84 dB@ DC-10Hz.
point   Input signal: Up to ±10 Volt @ DC-7 KHz or 4-20mA @ DC-7KHz.
point   8 Contact Closure signals with 125VAC@0.5A or 24VDC@1A rating.
point   Wide input power range: 10-28VDC.
point   Low Offset Temperature Drift: Better than 15 ppm/deg.C

point   Very small size: Tx: 22.5 mm width Rx: 45 mm width
point   Low cost - Starting from US$1289.- per pair (Rx + Tx, MM Optics)
point   Flexible Analog and Digital I/O configuration (+/-10V and 4-20mA mixed, TTL/Contact closures mixed)
point  OverFlow and Underflow Alarm LEDs + Open Collector signals at the transmitter
point  Out of Range and No Link alarm LEDs + Open Collector signal + Contact Closure at the receiver.

For more information about a similar link with 2 Analog inputs and 4 Digital inputs click here.

Dimensions: (in mm)

AFL-284 dimensions


Analog Bandwidth: DC-7KHz.
Digital Bandwidth: DC-20Kbps
S/N ratio DC-10Hz: 84dB
Supply Voltage: 10V-28V
Supply current: RX: 300-410mA, TX:300mA @ 12V in
Lower current at higher supply Voltage
Analog Input Range: +/-10V or 4-20mA
Output Voltage Range: +/-10V and 4-20mA
Non-Linearity Error: 0.05% @+/-10V range
Noise: Better than 2.5mV RMS
Input Impedance:

1 Giga Ohms (FET Amp)
CMOS inputs for Digital I/O

Optical budget with Single Mode transceivers: 27 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  Analog inputs can be mixed: 0,4 or 1,3 or 2,2 or 3,1 or 4,0 inputs of +/-10V,4-20mA.
point  Digital inputs can also be mixed between 0-3.3V, 0-5V, 0-12V, 0-24V or Contact Closures at any combination.
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 50km - with 15.5 bits accuracy. (14 bit + 1.5 bits more due to oversampling and resolution enhancement technique).


Battery operated power supply:
Can run up to 2 Rx or 1 Tx units for up to 24 hours.
Includes a 12 V/ 9 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 TX modules or 6 RX modules and a power supply or more modules with external power supply.

AFL-284 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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