8-Channel Supervised Contact Closure

FDC80 Series

Example of 8-Channel Supervised Contact Closure

Availability: Worldwide

PDF Datasheet: en  




-40 º to +75 ºC




Made in the USA




TAA Compliant

The ComNet FDC80 Series contact closure transmitter and receiver units provide transmission of up to eight independent supervised or unsupervised dry switch or relay contact closures over a single optical fiber, or any two-wire RS-485 copper circuit. Microprocessor-based logic transmits the contact closure information in packets that are ordered and encoded, ensuring extremely robust and reliable transmission. Packets that are garbled, or packets out of sequence with transmission bit errors will not cause random changes of state in the FDC80R receiver unit relays. The supervising function in the FDC80T transmitter allows for the detection of short and open circuit conditions, and normally open or normally closed contact inputs are supported. System faults are displayed via LED status indicators, and user-programmable summary fault alarm contacts are triggered in the FDC80R receiver unit. The FDC80R receiver is offered in both latching and non-latching relay configurations. External series and shunt resistors are included for each of the 8 contact input channels, for contact supervision.

Features for FDC80 Series

  • Microprocessor-based logic and latching relays in receiver unit eliminate random contact closure status in the event of loss of link or loss of prime operating power.
  • 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.
  • ComFit standard form factor is interchangeable between stand-alone or rack mount use.
  • Standard ComFit models are hot-swappable.


  • Alarm Event Triggering
  • Fire Alarm & Intrusion Detection Systems
  • PIR Signal Transmission
  • Building Automation and Environmental Control Systems
  • Lane/Gate Control

FDC80 Series Application Diagram(s) (1)

Application Diagram(s) for FDC80 Series

FDC80 Series Ordering Information

Part NumberDescription
FDC80TM18-Channel Supervised Contact Closure Transmitter. Lifetime Warranty.
FDC80TS18-Channel Supervised Contact Closure Transmitter. Lifetime Warranty.
FDC80T4858-Channel Supervised Contact Closure Transmitter, RS-485 Interface. Lifetime Warranty.
FDC80NLRM18-Channel Supervised Contact Closure Receiver (Non-Latching). Lifetime Warranty.
FDC80NLRS18-Channel Supervised Contact Closure Receiver (Non-Latching). Lifetime Warranty.
FDC80RM18-Channel Supervised Contact Closure Receiver. Lifetime Warranty.
FDC80RS18-Channel Supervised Contact Closure Receiver. Lifetime Warranty.
FDC80R4858-Channel Supervised Contact Closure Receiver, RS-485 Interface. Lifetime Warranty.
FDC80NLR4858-Channel Supervised Contact Closure Receiver (Non-Latching), RS-485 Interface. Lifetime Warranty.