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2
Operating Instructions
2.1
Scope of Application
The RS485 / FO Signal Converter is used for optical connection of up to
31 units with a bus-enabled electric RS485 interface to an FO
connection that leads, e.g., to a star coupler, thus allowing to establish
an interference-immune connection between the field devices and the
centralized operating unit.
2.2
General Data
The signal converter has a plastic housing that can be snapped onto a
DIN EN 50022 mounting rail. The optical interface is equipped with
BOFC ST-connectors and designed for signals with a wavelength of 820
nm. The differential RS485 bus interface to the terminal units is
connected via a 2-pole terminal block or a 9-pin SubD socket. Up to 31
devices can be connected to the bus. For point-to-point connection, the
line can be terminated using a resistor terminator. The auxiliary power
supply is fed in via 2 terminals. Because of its extremely wide auxiliary
voltage range (DC 24 - 250 V and AC 60 - 250 V), the converter can be
connected without switchover to all common types of station batteries
and AC mains voltage supplies. The front cover has LEDs for indication
of the operating voltage status (green LED) and for the data flow in all
directions (yellow LED).
The readiness for service of the unit is indicated by means of a potential-
free signalling contact (terminals 1,2) that can be used to communicate
the following fault conditions to a control center:
• No supply voltage
• Failure of internal power supply
When a fault condition is present, the contact is closed.
RS485/FO signal converters are available in two versions:
• one-channel version with BOFC ST-connector:
• two-channel version with BOFC ST-connector:
12.10.2006
RS485-FO Converter 1-channel
7XV5650-0BA00
7XV5651-0BA00
Page 9 of 28
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