Fiber Optic Links

AFL - 80 Digital / Dry Contact Closure OEM Fiber Optic Link

  1. AFL - 80 Digital/Dry Contact Closure Fiber Optic Link is the right choice when you need to:
  2. Transfer 8 Digital Control Signals from a Noisy Environment
  3. Isolate Digital Signal from High Voltage Sources
  4. Control Systems over a Long Distance
  5. Reduce Wiring Costs
  6. Get Rid of Interferences and Spikes Point
  7. Get Fast and Accurate Response to your Control Signals

The AFL - 80 Digital / Dry Contact Fiber Optic Link can transmit 8 Contact Closures or 8 TTL Signals over a Long Range at a 150kHz update speed. The AFL - 80 was primarily designed for Industrial and Control Applications. The product is available in 3 Versions: TTL Outputs, Low Current / Voltage Contact Closure, High Current / Voltage Contact Closures.

TTL Version: The Transmitter is Sampling the 8 Digital TTL Inputs Simultaneously at a rate of 180kHz and Transmits their Status to 8 Digital Outputs at the Receiver End. 8 TTL Outputs at the Receiver End would be Updated to Exactly the Same Status (“0” or “1” Logic Level) as in the Transmitter.

Contact Closure Version: The Transmitter is Sampling the Status of 8 Contacts (“ON” or “OFF” Status) and Transmits them over the Optical Link to the Receiver. Those Outputs are available as 8 Form C Relay Contacts with 2 Different Ratings: 24V@1A or 230VAC@16A.

A “LINK” Alarm LED and Form C Relay Contact enables the user to know if the link was disconnected and take any precautions needed to halt the system. A TTL Signal is available at the TTL Version of the product.

Input Sampling and Output Updates may be Synchronized to External Circuits or Controllers by using the “SAMPLE” Pin at the Transmitter or at the Receiver. This Pin provides a TTL Pulse Every Time that the Input Status is Read (at the Transmitter) or that the Output Status is Updated (at the Receiver End).

AFL - 80 Contact Closure Version, upto 260VAC, 16A, 4000VA Max. per contact, Form C

AFL - 80 TTL Version
0 - 5V / 0 - 3.3V Digital Signals

AFL - 80 24V / 1A Contact Closures, Form C

Metal Enclosures

DIN Rail Holders
24V DC Converters Available

  1. The AFL - 80 Consists of the Following Components:
  2. A Digital Input Fiber Optic Transmitter: AFL - 80 / TX, with TTL / Contact Closure Compatible Inputs.
  3. A Digital Fiber Optic Receiver: AFL - 80 / RX. This Unit can be configured with Dry Contacts (1 change-over per Input) or with TTL Outputs.
  4. Upto 3km of Multi-mode Glass Fiber or 50km of Single-mode Fiber (Optional). Optical Budget with Single Mode Transceivers: 30dB
  5. 2 Power Supplies of 12V: One for Each Side. The units can be modified to 24V + DIN Rail Case and Holder for DIN Rail Mounting.
  1. Features:
  2. Excellent Signal Isolation; Prevents Ground Loops and High Voltage Spikes.
  3. Very Fast Response: upto 70µSec at TTL Version, 1.5 - 3mSec @ Contact Closure Version.
  4. Transfers Digital Control Signals to a distance of upto 1.6km (50km with Single-mode Transceivers)
  5. Input Signal: 0 - 5V Logic Level @ DC - 40kHz (@ TTL Outputs Version)
  6. 3 Versions Available: TTL, 24V/1A Contacts, 230V/16A Contacts
  7. Very Small Size: TX: 68 * 54 * 12mm, RX: 109 * 83 * 12-20mm
  8. Relay ON/Off Time: Hold - 3mSec, Release - 1.5mSec (Average)
  9. TTL Output On/Off Time: 50nSec (Rise or Fall Time)
  10. TTL Output Update Rate: 180,000 Times per second!
  11. High Voltage Isolation between Tx and Rx - upto millions of Volts
  12. Form C Contacts: Can be connected as Normally Open or Normally Closed
  1. Advantages:
  2. Low Noise Transfer of Digital Data, particularly beneficial in Electrically Noisy Environments and for Transmission over Long Distance.
  3. Equipment control at High Voltage Platforms with Excellent Isolation.
  4. Optional Single-mode Transmitter and receiver allows 30dB Optical Budget for Longer Range.
  5. Transmit 8 Contact Closures or TTL Lines over distances of over 50km (Single-mode Fiber).
  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 Lightning, High Voltage Spikes etc.
  8. Replaces bulky multi-wire cables with single, compact fiber optic cable - especially important when rewiring existing ducts. Cheaper than using 8 copper cables for distances over 100m
  1. Technical Specifications

Input Range:

0 - 5V Logic Levels related to TX Common Ground

Output Contacts:

Normally Open, Common, Normally Closed
Each Relay is Isolated from the Others

Contact Ratings

Low Current Contacts:

  1. 24VDC @ 1A
  2. 125VAC @ 0.5A
  3. Form C Contacts
    (Common, Normally Open, Normally Closed)

High Current Contacts:

  1. 260VAC @ 16A
  2. Max. 4000VA
  3. Form C contacts
    (Common, Normally Open, Normally Closed)

Other Specifications

Frequency Response:

DC to 40kHz (for TTL version)

Timing Jitter:

7µSec Max.

Supply Voltage:

12V Regulated, Floating Power Supply

Optical Fiber:

Glass, 62.5/125 micron dia. Standard (upto 3km)
ST Connector Standard, SMA Optional

Transmission Range:

Upto 3km Standard (MM Fiber)
50km Optional with Single-mode Transmitter

Optical budget with Single-mode Transceivers:


5V Output Terminal Current:

Upto 100 mA

Relay ON/Off Time:

Hold: 3mSec, Release: 1.5mSec (Average)

Voltage Isolation

Input to Output:

Infinite Voltage Isolation

Input / Output to Mains:

800V Standard, upto 2,500V Optional

Output to Output:

Over 800V @ Contact Closure Version

Battery Operated:

Infinite Voltage

Relay to Relay Isolation Voltage:

800V Max.

  1. Ordering Information:
  2. The AFL - 80 may be ordered with Single-mode or Multi-mode Optical Receivers and Transmitters. Single-mode Transmitters work in a Different Wavelength than Multi-mode Transmitters and they cannot be combined! They are suitable for different types of Optical Fibers.
  3. If you already got a Fiber installed, please check the type of Fiber before placing your order.
  4. Each Side needs a Separate Power Supply or Battery. All Units, on the Same Side, which Share the Same Common Ground, may use the Same Power Supply
  5. A Stabilized Power Supply may supply power for upto 5 (optionally 10) Receivers or Transmitters (with 16 I/O Lines each).
  1. Power Supplies:

AFL - 80 - 03: 3 Channel Power Supply
(For One Side: Rx or Tx or Mixed)

AFL - 80 - 10: Power Supply for Powering upto 10 Units (For One Side)

AFL - 80 - BAT:
(Battery Operated Power Supply)

Can run 6 Transmitters or 3 Contact Closure Receivers for upto 10 Hours. Includes a 12V / 6.5AH Battery, Charger + Cables. Other Batteries available per request.
(Available in OEM version)

Battery Operated Power Supply
Housed in a Metal Case

All Specifications are subject to change without a Prior Notice

For any sort of clarifications kindly contact: