8-Channel Optically Isolated Contact Closure Transmitter


Example of 8-Channel Optically Isolated Contact Closure Transmitter

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-40 º to +75 ºC




Made in the USA




TAA Compliant

The ComNet FDC8ISOT 8-Channel Contact Closure Transmitter unit provides up to eight independent normally-open (NO) dry contact closures over one multimode or single-mode optical fiber, when used in conjunction with the companion ComNet model FDC8NLR Non-Latching Receiver or FDC8R Latching Receiver units. Each of the contact closure inputs are optically isolated at 1500V to ground, for those applications where high stray or transient voltages may exist. Microprocessor-based logic in the FDC8ISOT Transmitter detects a customer-furnished switch or contact closure, and encodes the closure into robust data packets that are mapped and transmitted to the FDC8NLR Receiver. Packets received with excessive bit errors will not result in random changes in the receiver relay contact resting or actuated states, making this system ideal for mission-critical remote switching applications. Plug-and-play design ensures ease of installation and operation, and no optical or electrical adjustments are ever required.

Features for FDC8ISOT Series

  • Designed to meet full compliance with the environmental requirements (ambient operating temperature, mechanical shock, vibration, humidity with condensation, high-line/low-line voltage conditions, and transient voltage protection) of NEMA TS-1/TS-2 and the Caltrans Specification for Traffic Signal Control Equipment.
  • Point-to-Point architecture
  • Optically isolated inputs rated at 1500 V to ground
  • Microprocessor-based logic eliminates random contact closure status in electrically noisy environments.


  • Remote control of mission-critical vital trackside relaying or roadside signaling equipment
  • Remote operation of lane, gate, or door operators or controllers
  • Building HVAC, industrial control, and SCADA networks
  • Non-latching fire and intrusion alarm systems
  • Non-latching triggered alarm & PIR (Passive Infrared) detection systems
  • Latching Relay output applications

FDC8ISOT Series Application Diagram(s) (1)

Application Diagram(s) for FDC8ISOT Series

FDC8ISOT Series Ordering Information

Part NumberDescription