Low Speed RS-422/530 (MIL-STD-188C-114A) Datacom Products
FiberPlex FOI-2591 Fiber Optic Isolator/Converter/Modem - EIA-530/RS-422; mission critical packaging

Packed in rugged military style metal enclosure, the FOI-2591 Series units Isolate and Extend Serial (EIA-530/RS-422) over fiber at rates up to 256 kbps

Not recommended for new designs. See FOI-4451 for a functional replacement.
Used in pairs, the FOI-2591 (to DTE) and FOI-2951 (to DCE) provide end-to-end conversion, extension, and electrical isolation of EIA-530/RS-422 circuits. Multimode optics extends the distance to 2km, while singlemode optics extends the distance to 20km. The units are transparent to all handshaking protocols, and can accept data and clock signals up to a maximum rate of 256 kbps. A regeneration switch on the FOI-2591 enables users to toggle between synchronous applications that require send timing (ST) and asynchronous or synchronous applications that require terminal timing (TT).

They support tail circuit and null modem functions for DCE to DCE or DTE to DTE communications. An alternate interface (V.35 or RS-232) may be installed at the opposite end, allowing the user to create a fully isolated interface converter.

The units 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 they 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 an FOI-2591 at the Data Communication Equipment (DCE) and an FOI-2951 at the Data Terminal Equipment (DTE) with a duplex fiber optic cable in between.

FiberPlex FOI-2591 application diagram

  • Serial Data (TIA/EIA-422, MIL-STD-188-114A and FED STD 1030A) Fiber Modem and Converter
  • Multimode extension of up to 1.2 miles (2 km), singlemode extension up to 12.4 miles (20 km)
  • Supports Data Rates from DC to 256 kbps
  • Tail circuit and null modem functions for DCE to DCE or DTE to DTE
  • Pairs with other FOI with V.35 or RS-232 interfaces for interface conversion
  • 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
sales@patton.com or +1 301 975 1000

Sales: sales@patton.com / +1 301 975 1000
Support: support@patton.com / +1 301 975 1007
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