INS_FDC24NL[SFP]_REV–
12/29/11
PAGE 1
INSTALLATION AND OPERATION MANUAL
FDC24NL[SFP] Series
24-CHANNEL DUPLEX CONTACT CLOSURE TRANSCEIVER
The ComNet FDC24NL Series contact closure transceiver units provide transmission
of up to twenty four independent duplex dry switch or relay contact closures using
a single SFP optical port or any four-wire RS-422 copper circuit. The FDC24NL Series
supports an integrated field expandable RS-422 data bus allowing up to 12 uniquely
addressed units to be connected to the bus providing up to 288 unique duplex
contact closures over a single SFP optical port or RS-422 copper circuit.
The contact closure information is sent in packets that are ordered and encoded,
ensuring extremely robust transmission. Packets that are garbled, packets out of
sequence, and transmission bit errors will not cause random changes of state on
the contact relays. One relay can be optionally re-purposed as a summary fault
alarm contact and is triggered in the event that the unit loses fiber or RS-422 bus
communications. The FDC24NL series is offered with non-latching solid state relays.
Each module incorporates link and individual status indicating LEDs for monitoring
confirmation of contact closure input and output of each of the twenty four channels.
Packaged in the exclusive ComNet ComFit housing, these units may be either wall
or rack-mounted, or may be DIN-rail mounted by the addition of ComNet model
DINBKT1 or DINBKT4 adaptor plate.
This manual serves the following
ComNet Model Numbers:
FDC24NL
FDC24NLSFP
