REF 542plus switchbay protection and control unit
Manual Part 3: Installation and Commissioning
1VTA100004-en DMS,2001-10-04 REF542plus: Installation and Commissioning 41 / 80
COM1
COM2
BB
RS232-optical
cable
RS232 cable
RS485cable
HMI
CENTRAL Unit
Figure 9: Test configuration of the REF542plus
6.2.5.1 RS232 cable
This standard serial communication cable is needed for the communication between
the PC and the Central Unit. The connector on the central unit for this purpose is X72.
6.2.5.2 REF542plus optical cable.
The HMI must be interfaced to a PC through the ABB RS232 optical cable. The opti-
cal converter must be plugged in the connector situated on the front side of the HMI.
By using this interface the configuration file can be downloaded or uploaded from the
local PC, which hosts the configuration tool, to the REF542plus central unit. Besides
that, protection and operation events and the value of the measurement quantities
stored in the REF542plus can be uploaded from the local PC for monitoring purpose.
D-sub
Opto converter
Figure 22: ABB RS232 - optical cable for the connection to the HMI
6.2.5.3 RS 485 Cable
This cable is normally used for the connection between the HMI as Local Control Unit
and the Central Unit in the LV compartment. This cable is connected to the connector
X73 on the Central Unit.
6.3 Self test of the Central Unit
By means of the self test the functionality of the REF542plus Central unit can be
proved.
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