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2
1 Operating Instructions
2.1
1.1 Scope of Application
The Mini Star Coupler is used for optical connection of up to four
terminal units with an optical interface in a star topology to a master unit
for centralized operation, thus allowing to establish an inter-ference-
immune connection between the field devices and the centralized
operating unit. Direct communication between a PC and the terminal
units is possible via the integrated RS232 interface.
2.2
Technical Features
The optical mini star coupler distributes the messages to all terminal
units via up to 4 optical interfaces. The number of terminal units can be
increased by a cascade connection. The transmitter output of the mini
star coupler is connected to the receiver input of the appropriate terminal
unit. As the messages contain an address, only the addressed terminal
unit responds. The terminal unit then answers to the PC via the mini star
coupler's receiving and transmitting interface. It is thus possible to
optically connect up to four terminal units to a central unit. Cascading of
the mini star coupler is possible.
• All optical inputs and outputs (full duplex) have ST-BOFC
connectors and can be set individually to Light ON or Light OFF in
idle state.
• Data transmission is transparent, i.e. protocol-independent.
• The wavelength of all optical inputs and outputs is 820 nm.
• The typical distance to the system interfaces of the protection
devices spanned by FO cables is 1.5 km.
• The star coupler has an integrated power supply unit and is
lodgedin a plastic housing.
• The auxiliary power supply of the star coupler can be operated
without switchover in the rated voltage ranges of DC 24 - 250V and
AC 60 - 230V.
• LEDs are provided for indication of the operating voltage (green
LED) and of data transmission (yellow LEDs).
2.3
General Data
The star coupler is equipped with one optical PC input and output and
4 optical inputs and outputs to the terminal units. Cascading of the star
Page 8 of 28
Mini-Starcoupler
19.10.2006
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