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The IFS DT/DR3000 series contact mapping transmitter and receiver provides transmission of up to eight independent contact closures over one optical fiber. Utilizing microprocessor- based logic for exceptionally robust communications channel redundancy, and a trickle-charged nickel-cadmium (NiCd) battery back-up memory within the receiver module, the DT/DR3000 series eliminates the possibility of any of the relay contacts returning to a random resting state in the event of an optical fiber breakage or loss of prime operating power at the receiver end of the link. Models within this series are available for use with multimode or single mode optical fiber. Plug-and-play design ensures ease of installation requiring no electrical or optical adjustments. Each module incorporates power and individual status indicating LED's for monitoring confirmation of contact closure of each of the eight channels. The modules are available in either stand-alone or rack mount versions.