Serial Converter EIA-530/RS-422, 128Kbps

Model #: FOI-2591 | FOI-2951

FOI-2591 | FOI-2951

The FOI-2591 and FOI-2951 both provide complete electrical isolation for RS-422 communications. 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 allows 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. This requires two of the same FOI units. An alternate interface (V.35 or RS-232) may be installed at the opposite end, allowing the user to create a link between two electrically incompatible interfaces without requiring a separate 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. Privacy of communications is also enhanced because the fiber optic cable does not radiate any emissions. FiberPlex recommends “R” units for high security applications because they have added filtering and shielding for RFI suppression. In addition, fiber optic cable offers much longer transmission distances than traditional RS-422 cabling. Multimode optics on the units can extend the distance to 2km, while singlemode optics can further extend the distance to 20km. 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 between them.

Flexible Mounting and Powering Options

The FOI-2591 and FOI-2951 are part of the FOI line of products designed for ruggedized mil applications. They are housed in the familiar FOI shielded can enclosure. For standalone applications they can be powered by adding a PSQ‐2909 AC supply or a PSQ‐2920 DC power supply (not included). Optionally, up to 8 FOI units can be mounted on CMA chassis adapters and installed in an RMC‐3101 or RMC‐2101 rack mount chassis. The units are powered redundantly by a common back plane connection.

  • Serial Data to Fiber
  • Data Rate: DC to 256 kbps

Compatable with:

  • TIA/EIA-422
  • MIL-STD-188-114A balanced type 1
  • FED STD 1030A
ELECTRICAL SPECIFICATIONS
 
Min
Typ
Max
Power Requirement Voltage Range (V)
7
9
12
Supply Current (mA)
-
375
-
 
Balanced Differential Signals Data Rate (kbps)
DC
-
256
Sampling Jitter (%)
0
-
17
Input Resistance (kΩ)
12
15
-
Common-Mode Input Voltage (V)
-
-
±7
High-Level Output Voltage (V)
2.4
-
-
Low-Level Input Voltage (V)
-
-
0.5
 
Unbalanced Single Ended Signals Data Rate (kbps)
DC
-
9.6
Sampling Jitter (%)
0
-
10
Input Resistance (kΩ)
3
5
7
Input Voltage Range (V)
-30
-
-30
Output Voltage Swing (V)
-
±5
-
 
Environmental Storage Temperature (°C)
-40
-
85
OperatingTemperature (°C)
0
-
50
 
Interface Connector FOI-2591 DB-25 Male
FOI-2951 DB-25 Female
PHYSICAL SPECIFICATIONS - All
 
Length
Width
Height
Weight
Case Dimensions Size 2
4.5 in (114 mm)
1.312 in (33 mm)
2.562 in (65 mm)
2 lb (0.9 kg)
OPTICAL CHARACTERISTICS
Fiber
Size
Max Distance
Wavelength
Output Power
RX Sens Loss Budget
Multimode
62.5 / 125 μm
2 km (10Base) 300m (100Base)
820 nm
-18 dBm
-30 dBm 12 dB
Singlemode 9 /125 μm 20 km 1300 nm -15 dBm -32 dBm 21 dB
oi_FOI-2591.png
Standalone Operation  
PSQ-2909  Standalone AC Power Supply
PSQ-2920 Standalone DC Power Supply
WMA-3002 Wall Mount Adapter
WMA-2001 Wall Mount Adapter with ST Optical Patch
Chassis Mounting  
RMC-2101 2U, 19" Rack Mount Chassis. Holds up to 9 FOI Modules
CMA-2001 Chassis Mount Adapter for RMC-2101 Chassis. (1) per FOI Module required
PSM-2010 Spare Power Supply for RMC-2101
  
RMC-3101 3U, 19" Rack Mount Chassis. Holds up to 9 FOI Modules
CMA-3002 Chassis Mount Adapter for RMC-3101 Chassis. (1) per FOI Module required
PSM-3010 Spare Power Supply for RMC-3101
Industrial Solutions
RMC-3700  
CMA-3002 Chassis Mount Adapter for RMC-3101 Chassis. (1) per FOI Module required
PSM-3010 Spare Power Supply for RMC-3101

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