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1 Introduction
Serial Interfaces
Via the serial operator interface in the front panel the communication with a personal
computer using the operating program DIGSI
operation of all functions of the device.
The service interface can also be used for communication with a personal computer
using DIGSI
devices to the PC or for operation via a modem.
All device data can be transferred to a central master or main control system through
the serial system (SCADA) interface. This interface may be provided with various pro-
tocols and physical transmission modes to suit the particular application.
Another interface is provided for the time synchronization of the internal clock via ex-
ternal synchronization sources.
The operator and service interface allow the communication from one PC with the
devices at all ends of the protected object during commissioning, checking and also
during operation of the device, using a standard browser. A software program named
„WEB-Monitor") supports this function which has been optimized with regard to the
line protection system.
Protection Data
The protection data interfaces are a particular case. Depending on the model there are
Interfaces
one or two protection data interfaces. Via these interfaces the measured value data of
each end of the protected object is transmitted to the other ends; during this procedure
measured values from the other ends may also be added. Further information such as
closing the local circuit breaker, pickup of the inrush restraint as well as other external
trip commands coupled via binary inputs or binary information can be transmitted to
other ends via the protection data interfaces.
Power Supply
These described functional units are supplied by a current supply PS with the neces-
sary power in the different voltage levels. Brief supply voltage dips which may occur
on short circuits in the auxiliary voltage supply of the devices are usually bridged by a
capacitor (see also Technical Data, Chapter 4.1).
22
®
. This port is especially well suited for dedicated connection of the
®
is possible. This permits convenient
C53000-G1176-C169-1
7SD5 Manual
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