Siemens SIPROTEC 7SS523 V3.2 Manual page 276

Installation and Commissioning
Figure 7-8 Remote control of the central unit
7.3.2.3 Operating Modes
Direct serial link
Dial-up donnection
through a modem
Operation with a
star coupler
260
The Web-Monitor works in the following operating modes set between the operator PC
and the SIPROTEC 4 device:
Direct link between the device's front or rear service interface and the serial interface
of the operator PC. For this link the 9-pin cable must be used that is supplied as an
accessory with DIGSI.
Serial connection of the rear service port of the device with a modem in the system.
This connection can be electrically implemented via RS232 (over short distance) or
via fibre optics. The connection to the system modem is established from the office or
from any other system using a switched line. DIGSI-Remote can also be carried out
using this connection. Thus, parameters of a remote device can also be changed du-
ring the installation.
Connection between the device's rear service interface and a star coupler using a di-
rect optical link. Connection of the operator PC's serial interface to a star coupler. In
7SS52 V4 Manual
C53000-G1176-C182-1