ABB REJ 523 Technical Reference Manual page 36

REJ 523
36
Technical Reference Manual
Although the module RER 103 supports both SPA bus and LON bus communication,
the relay only allows the use of SPA bus. LON communication is possible with a
separate LSG module.
READY START
ABB
1
Figure 4.1.9.1-1 Front connector (1) for remote communication
Via the optical PC-connector on the front panel the relay is connected to a PC used
for setting. The front interface uses SPA-bus protocol.
The optical PC-connector isolates the PC from the relay galvanically. 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 cable works
correctly with baud rates 4.8 and 9.6 kbps.
The following serial communication parameters shall be used for RS-232C:
• Number of data bits
• Number of stop bits
• Parity
• Baud rate
Relay data, such as events, setting values, all input and recorded data, can be read via
the optical PC-interface.
When setting values are altered via the optical PC-interface, the relay checks that the
entered parameter values are within the permitted setting range. The relay refuses to
accept too high or too low a setting value and keeps the former setting unchanged.
TRIP
C
E
7
1
even
9.6 kbps as default
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