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RD300-OFR
Serial RS232/RS422/RS485 to multimode
fiber optic media converter, multipoint & fault tolerant
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Why using fiber optic ?
Using fiber optic enables to use a higher communication bandwidth while
offering a total immunity against EMI/RFI interferences and an increased
security as well.
The optical fibre still offers other advantages: use without risk in
an explosive environment, no EMC emission, no ground loops, immunity against
lightning and high voltage environments, they are finally lighter, less
cumbersome, inert and corrosion resistant ...
Plug & Play
The RD300-OFR device features a self configuration mechanism based on
a CPLD component freed you from the tiresome operation which consist in
the serial parameters setup, product is "Plug & Play".
Security & fault tolerance (redundancy)
RD300-OFR features in standard a built-in system to control the fiber
integrity, it reports automatically any failure with an error LED and
also setup a relay contact (MOSFET) to activate any external safety device.
The RD300-OFR device features two pairs of fiber, the second one can be
used to provide the redundancy of the first one, an "OR" mechanism
makes it possible to receive data from any of those pairs in case of failure
or fiber breakdown.
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Technical chracteristics overview
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Serial link
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Optic fiber
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3 in 1 interface: RS232, RS422 & RS485 |
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Pluggable solderless screw terminal
field |
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RS422/RS485 speed up to 2 Mbps, 1 Mbps
in RS232 mode |
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Serial link parameter self
configuration "Plug & Play" |
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RS232 signals: TxD, RxD, GND |
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RS422 signals: TxA, RxA, TxB, RxB, GND |
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RS485 signals: TRxA, TRxB, GND |
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Configurable polarization & terminating
resistors (mini-switches) for RS422/RS485 |
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Automatic RS485 line turn-around, software
independent |
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Half-duplex & Full-duplex modes
support |
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Serial protocols: The RD300-OFR
device supports any kind of communication protocols
(Modbus, Unitelway, Profibus, DH+, ASCII or binary
serial protocols ...) |
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15 KV ESD protection
and HF filtering |
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Multimode
optic fiber |
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50/125 µm,
62.5/125 µm, 100/140 µm & 200 µm
fibers support |
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ST type connectors |
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Transmission up to 5000m on a 100/140
µm fiber at 25°C |
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Wave lenght: 820 nm |
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Power budget: 22.4 dB |
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Selectable ON/OFF state
of the fiber light at the idle state |
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5 dB & 11 dB attenuator
for short distance communication, mini-switches
selectable |
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Reliable communication
without any error even in case of significant EMI/RFI
interferences |
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Bi-directionnal transmission |
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Topologies: Point to point,
simple ring, single-master & dual-master buses,
redundant fiber ring, dual ring with dual master,
dual point to point & star network |
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Infinite galvanic isolation
through the optic fiber |
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Fiber breakdown self diagnostic,
failure is reported on a LED and a relay contact
(MOSFET) is activated |
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Power supply, signalling and other characteristics
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Point to Point topology
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This configuration enables to control a single equipment installed
in a very polluted or distant area. The optical line is totally
insensitive to EMI/RFI perturbations.
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Simple ring topology
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This topology enables to build a simple ring whereas the master
equipment is installed in the middle.
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Single master bus topology
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Each media converter device enables to connect to the network
one or more slaves peripherals controlled by the master which
governs exchanges using addressing sequences.
All the slaves equipments receive data transmitted by the master
and answer are then received only by the master.
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Dual master bus topology
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By using this configuration, data transmitted by the "A"
master are received by all the slave equipments and by the "B"
master (backup station) as well.
The answers from slaves are received by all the slaves and by
masters "A" & "B" as well.
Such configuration brings security to the application as the
"B" master warrants the system to work even in case
of master "A" failure or fiber breakdown.
Both "A" & "B" masters can be a single
equipment with two independant serial ports.
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Redundant ring (fault tolerant)
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A single ring is used in this configuration but data are transmitted
simultaneously on the two rings, this is a single master topology.
The master doesn't retransmit the data he receive in order
to avoid infinite data loop.
In case of fiber breakdown, the equipments will still continue
to receive data on the only line.
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Dual ring & dual master topology
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This topology should be used when an equipment needs to answer
to different masters located on distinct networks.
The RD300-OFR device can also be used as a simple repeater or
as a fiber optic converter to be compatible with other equipments.
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Dual point to point network
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This topology should be used when EMI/RFI perturbations concern
only a part of the whole installation.
Redundancy provides a double security for the sensitive link.
Moreover, any fiber failure is reported on a LED and a relay
contact (MOSFET) in activated.
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Star topology
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The device works as an RS485 network repeater and makes it possible
also a star topology in a polluted environment.
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Reference to order:
| RD300-OFR |
Serial
RS232/RS422/RS485 to multimode fiber optic media converter, multipoint
& fault tolerant, +9VDC to +36VDC power supply,
din rail mounting |
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