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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.
Indicating LEDs for monitoring power, contact closure status, and summary fault
Automatic resettable solid-state current limiters
Microprocessor-based logic and latching relays in the receiver unit