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2.5
2.5.1
2.5.2
124
Serial communication
Table 131: Serial communication (RS485)
Function
Protocol
Communication speed
Table 132: Serial communication (SPA) via front
Function
Protocol
Communication speed for the terminals
Slave number
Change of active group allowed
Change of settings allowed
Serial communication, IEC (IEC 60870-5-103 protocol)
Application
This communication protocol is mainly used when a protection terminal communicates with a
third party control system. This system must have a program that can interpret the IEC
60870-5-103 communication messages.
Design
The IEC protocol may be used alternatively on a fibre optic or on an RS485 network. The fibre
optic network is point to point only, while the RS485 network may be used by multiple terminals
in a multidrop configuration.
Note!
The RS485 network shall be terminated properly according to the standard, either in the relay
terminal, by choosing the terminated RS485 interface, or externally as described in "Informa-
tive excerpt from EIA Standard RS485" in the Installation and commissioning manual.
The IEC 60870-5-103 protocol implementation in REx 5xx consists of these functions:
•
Event handling
•
Report of analog service values (measurements)
•
Fault location
•
Command handling
-
Autorecloser ON/OFF
-
Teleprotection ON/OFF
-
Protection ON/OFF
-
LED reset
-
Characteristics 1 - 4 (Setting groups)
•
File transfer (disturbance files)
Value
SPA/IEC 60870-5-103
9600 Bd
Value
SPA
300, 1200, 2400, 4800, 9600 Bd
1 to 899
Yes
Yes
Chapter 9
Data communication
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