ABB REL 551 2.3 Series Installation And Comissioning Manual page 59


Configuring the short range galvanic
modem
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No setting is available for the short range galvanic modem on the HMI. There are how-
ever some settings that can be made on a DIP-switch located behind the cover around
the line connector at the back of the terminal according to figure 14. After the connector
has been disconnected, if attached, the cover plate can be removed just by pulling at the
middle of the cover plate. No settings are located on the circuit board.
Line
connector
Cover
plate
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Only switch 1 and 2 are used on the DIP-switch. The function is according to the setting
of timing signal, see table 4. In normal operation switch 1 is set in ON position at one
end and switch 2 is set ON at the other end. The rest of the switches are set OFF.
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OFF OFF Unpredictable, normally locally created timing
OFF ON Timing recovered from received signal
ON OFF Locally created timing
ON ON Timing recovered from received signal
There are also some indication for supervision of the communication channel that can
be seen when the cover around the fibre optic connectors is removed. These LED's are
found below the DIP-switch. The function of the LED's are explained in table 5.
1
2
Off On
3
1
4
2
5
3
4
DCD
RD
TD
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