Westermo ODW-621, User Manual

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Optical fibre link functionality and status indication
At power on, all LED’s will be active during an initiation sequence followed by an auto-
matic initiation of the optical fibre link. The alarm will be set until the fibre optic link is in
operation and ready to transfer serial data. Data can be transferred over the fibre optic
link as long as the link is in operation.
When the fibre optic link is out of operation this will be indicated by a local alarm out-
put. When the link returns to operation, the alarm will reset automatically.
RS-232 interface
A 9-position female D-sub connector that handles full duplex data rates up to 250 kbit/s.
With RS-232 mode the RS-232 interface can handle an arbitrary data rate up to
250 kbit/s without any data rate or data bit settings.
With RTS/CTS control selected, the request to send (RTS) signals will be transferred
between the ODW-621s over the fibre optic network. These RTS signals are transferred
independently of the data transfer. An RTS signal received at one ODW-621 will set the
clear to send (CTS) signal at the other converter.
The data carrier detect (DCD) signal is set as long as the fibre link is in operation, ready
to transfer data. The data set ready (DSR) signal is set as long as the ODW-621 is in
service. If RTS/CTS is set to OFF will CTS always be set to active.
Redundant power supply, galvanic isolated (2 kVAC) to other ports
The ODW-621 should be supplied with safety extra low voltage (SELV). It is designed to
operate permanently over a wide DC or AC voltage input range and provided with two
independent inputs for enhanced redundancy if either supply fails.
Single- or multimode LC fibre connectors
The ODW-621 uses Small Form Factor Pluggable (SFP) transceivers that are in compli-
ance with Multi-Sourcing Agreement (MSA). A wide range of different fibre transceivers
and connectors can be used.
Status interface
This port enables supervision of fibre optic link status by a relay with both normally open
and closed contacts.
The status will be set if:
• Local or remote of fibre link errors exist.
• The unit is out of service, e.g. no power supply.
Designed for harsh environments, such as industrial, road and railway
applications.
The ODW-621 complies with standards for industrial environments, railway signalling and
telecommunications apparatus. Additionally the wide temperature range permits it to be
installed in out-door cabinets without any additional measures, such as heating, etc.