Fiber-Optic-Interface F422-G
  • Full Duplex connection between two devices with
    RS-422-B ports
  • Interference free data transfer using optical fibers
  • Full galvanic isolation between connected devices
  • Data transfer rate: > 20kbit/s
  • Suitable for 1mm plastic fiber, or 200µm HCS® glass fiber
  • Versatile Link fiber connections
  • Link distance: > 500m with 200µm HCS® glass fiber cable
  • Configurable for use at DCE or DTE (specify when ordering)
  • Selectable polarity of optical signal levels (specify when ordering)

The F422-G Fiber-optic data communications system may be used to replace existing electrical RS-422-B connections between devices, whenever interference free data communications are required.
This is achieved by converting the data stream into pulses of light , which are then transmitted along optical fibers. The integrity of the data transferred is therefore no longer susceptible to external electrostatic or electromagnetic fields. At the same time, the ports of the connected equipment are protected from damage by any potential differences between them. The conversion of the electrical signals into pulses of light is carried out by the F422-G interface.

The F422-G is configured using jumper links. Jumpers set the operating mode for the device connected to the F422-G (DTE or DCE interface).

It is possible to use the F422-G to connect between a device using an RS-422-B interface and a device using a direct optical port. Please ask the technical support for implementation details. The logical polarity of the optical signals is set by using two jumpers. The polarity of the transmit and receive sides may be set independently of each other

Correct connection of the duplex optical fibers is guaranteed through the mechanical design of the connectors.

In a full duplex connection using F422-G devices, data may be transmitted in both directions at the same time. Should flow control be required, the end systems should be configured to make use of Xon/Xoff handshaking.

Two LEDs indicate traffic on the data-lines. The yellow Rx LED lights whenever data is being received from the RS-422 port. The green Tx LED lights when the F422-G transmits data to the RS-422 port. In case of static signal levels the LEDs will be off.

Technical Data
Data transfer rate: > 20kbit/s
Link distance: > 500m using 200µm HCS® type glass fiber cable
> 75m using TC 1000W type plastic fiber cable
RS-422 port I/O levels: as per RS-422-B specification
RS-422 port input termination: 100Ω
RS-422 port connector: 8 way RJ45
F/O Transmitter output optical power: -20 … -10dBm into 1mm plastic fiber
-29 … -19dBm into 200µm HCS® fiber
F/O Receiver input sensitivity: -39dBm
Optical fiber connectors: HP/Agilent Versatile Link
Optical fiber cable types: 200µm HCS® glass fiber
1mm plastic optical fiber
Optical wavelength: λ = 660nm (red)
External power supply: 7.5 … 12Vdc / 100mA
Power supply connector: 4 way RJ11
Operating temperature range: 0°C < TA < +60°C
Storage temperature range: -30°C < TS < +75°C
Physical dimensions (L x B x H): 105 x 60 x 26mm3
Weight: 100g

Test conditions:
Connection between two F422-G interface modules.
DTE - Configuration, MARK == Light On.
Ambient temperature: 25°C.

Ordering Information

F422-G\10 RS-422 to Fiber Optic Interface
9725-0906 Plug-In Power Supply 90-264Vac 9Vdc / 0.6A EU mains plug RJ10
9725-0906-US Plug-In Power Supply 90-264Vac 9Vdc / 0.6A US mains plug RJ10
LWL-1000W-10 Terminated duplex standard 1mm plastic optical fiber, Length 10m
LWL-1000W-20 Terminated duplex standard 1mm plastic optical fiber, Length 20m
LWL-1000W-50 Terminated duplex standard 1mm plastic optical fiber, Length 50m
  Alternative cable lengths, glass fiber cables, ruggedized cables or UL specification cables available on request

HCS® is a registered trademark of SpecTran Corporation.