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  8 Channels Dry Contact over Fiber Optical Modem
  A pair of CLR-8DC-T & CLR-8DC-R is used to carry 8 pieces of dry contact info over a single core of fiber optical cable. These dry contact info includes detectors like smoke sensor, heat sensor, etc., alarms like intruder alarm, fire alarm, environmental alarms, etc. It is also possible with CLR-8DC-T/R to turn on and off a remote system or machine as if pressing the button locally.

Fiber lines are insensitive to EMI/RFI and transient surges, so they are ideal for data communications near heavy electrical equipment and other electrical or radio interference.