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Serial communication Chapter 9
Data communication
Table 131: Serial communication (RS485)
Table 132: Serial communication (SPA) via front
2.5 Serial communication, IEC (IEC 60870-5-103 protocol)
2.5.1 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.
2.5.2 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.
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)
Function Value
Protocol SPA/IEC 60870-5-103
Communication speed 9600 Bd
Function Value
Protocol SPA
Communication speed for the terminals 300, 1200, 2400, 4800, 9600 Bd
Slave number 1 to 899
Change of active group allowed Yes
Change of settings allowed Yes
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.
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