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1.1
1.2
182
Serial communication
Serial communication
Application, common
One or two optional serial interfaces with LON protocol, SPA protocol or IEC 60870-5-103 pro-
tocol, for remote communication, enables the terminal to be part of a Substation Control System
(SCS) and/or Substation Monitoring System (SMS). These interfaces are located at the rear of
the terminal. The two interfaces can be configured independent of each other, each with different
functionalities regarding monitoring and setting of the functions in the terminal. For more infor-
mation,
please refer to Table 176: "Serial communication protocols - possible combinations of
interface and connectors".
An optical network can be used within the Substation Control System. This enables communi-
cation with the terminal through the LON bus from the operator's workplace, from the control
center and also from other terminals.
The second bus is used for SMS. It can include different numerical relays/terminals with remote
communication possibilities. Connection to a personal computer (PC) can be made directly (if
the PC is located in the substation) or by telephone modem through a telephone network with
CCITT characteristics.
Design, common
The hardware needed for applying LON communication depends on the application, but one
very central unit needed is the LON Star Coupler and optic fibres connecting the star coupler to
the terminals. To communicate with the terminals from a Personal Computer (PC), the SMS 510
software or/and the application library LIB 520 together with MicroSCADA is needed.
The communciation alternatives available are shown in
Table 176: Serial communication protocols - possible combinations of interface and con-
nectors
Alt. 1
X13
SPA/IEC fibre optic
X15
LON fibre optic
When communicating with a PC, using the rear SPA/IEC port, the only hardware needed for a
station monitoring system is optical fibres and opto/electrical converter for the PC or a RS485
network according to EIA Standard RS-485. Remote communication over the telephone net-
work also requires a telephone modem. The software needed in the PC when using SPA, either
locally or remotely, is SMS 510 or/and CAP 540.
SPA communication is applied when using the front communication port, but for this purpose,
no special serial communication function is required in the terminal. Only the software in the PC
and a special cable for front connection is needed.
The IEC 60870-5-103 protocol implementation in REx 5xx consists of these functions:
•
Event handling
table
176.
Alt. 2
SPA/IEC RS485
LON fibre optic
Chapter 12
Data communication
Alt. 3
SPA fibre optic
IEC fibre optic
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