Iec 60870-5-103 Remote Communication Protocol - ABB REU 523 Technical Reference Manual

REU 523
4.1.10.2.
34
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
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The relay is connected to a PC used for setting via the optical PC-connector on the
front panel. The front interface uses the SPA bus protocol.
The optical PC-connector galvanically isolates the PC from the relay. The
connection consists of a transmitter stage and a receiver stage. The front connector
is standardized for ABB relay products and requires a specific opto-cable (ABB art.
no 1MKC950001-1). The cable is connected to the serial RS-232C port of the PC.
The optical stage of the cable is powered by RS-232C control signals.
The following serial communication parameters are to be be used for RS-232C:
• Number of data bits 7
• Number of stop bits 1
• Parity even
• Baud rate 9.6 kbps as default
Relay data such as events, setting values and all input data and memorized values
can be read via the optical PC-interface.
When setting values are altered via the optical PC-interface, the relay will check that
the entered parameter values are within the permitted setting range. If an entered
value is too high or too low, the setting value will remain unchanged.
The REJ 525 has an internal counter which can be accessed via
"COMMUNICATION" under "CONFIGURATION" in the HMI menu. The
counter value is set to 0 when the relay receives a valid message.

IEC 60870-5-103 remote communication protocol

The REU 523 supports the IEC 60870-5-103 remote communication protocol
(henceforward referred to as the IEC_103) in the unbalanced transmission mode.
The IEC_103 protocol is used to transfer mesurand and status data from the slave to
the master. However, the IEC_103 protocol cannot be used to transfer disturbance
recorder data.
The IEC_103 protocol can be used only through the RS-485 connection on the rear
panel. Connecting the REU 523 to the fibre-optic communication bus requires the
use of the fibre-optic interface module RER 103. The line-idle state of the RER 103
is "light off" whereas it is "light on" according to the IEC_103 standard. Therefore,
to achieve full compatibility in the physical layer between the relay and the master,
the IEC 60870-5-103 star coupler RER 125 is required. The RER 125 is used to set
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