Intercom, Alarm and Emergency Notification Systems
FiberPlex FOI-2890 Fiber Optic Isolator/Converter/Modem - alarm circuits with data and contact closures; mission critical packaging

Packed in rugged military style metal enclosure, the FOI-2890 Series transports Duplex Alarms with Controls over Fiber

The FOI-2890 provides complete electrical isolation for 4 channels of control signals and relay closures, and 2 channels of asynchronous or synchronous RS-232 communications. Multimode optics extends the distance to 2km, while singlemode optics extends the distance to 20km. During power failures or interruptions, the relays will hold the last commanded state until power is restored and the relays are commanded differently. This model is ideal for applications that include alarm indicators, lock actuators, and HVAC instrumentation and control.

These units are perfect for Alarm Indicators, Lock Actuators and HVAC Instrumentation and Control. The unit can be used in areas of high electrical noise or in and out of RF shielded enclosures. The fiber optic cable is not susceptible to interference caused by impulse noise, crosstalk, or EMI. Patton recommends “R” units for high security applications because the units have added filtering and shielding for RFI suppression.

FOI version units can be mounted in several redundant powering chassis; rack and wall mount options including Tempest and NEMA alternatives.

A typical link consists of two FOI-2890s, one at each end of the network, with a duplex fiber optic cable in between.

FOI-2890 applications

  • Delivers 4 channels of control signals and relay closures with 2 channels of asynchronous or synchronous RS-232 communications over fiber
  • Multimode extension of up to 1.2 miles (2 km), singlemode extension up to 12.4 miles (20 km)
  • Data Rate: DC to 230 kbps
  • Two TIA/EIA-232 (RS-232) TX and RX; compatible with MIL-STD-188C
  • Four 0 to +5VDC control signal inputs
  • Four SPST form A relay closure inputs
  • Rugged metal enclosures with RFI shielding


Ordering information for this product is not publicly available at this time.
Please accept our apology as we regret any inconvenience to you.

For more information
about the availability of this product and/or alternative solutions,
please contact Patton's Product Management team at or +1 301 975 1000

Sales: / +1 301 975 1000
Support: / +1 301 975 1007
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