ABB REL 551 2.3 Series Installation And Comissioning Manual page 58

52
Configuring the short range fibre optical
modem
The jumpers are accessible after the modem has been pulled out. This is done by first
removing all green 18-pin connectors at the back, then remove all screws holding the
back plate. After the back plate has been removed the modem can be pulled out.
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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 above the DIP-switches. The function of the LED's are explained in table 3.
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RTS Yellow Request to send
CTS Yellow Clear to send
DSR Yellow Data communication correct
DCD Yellow Detection of carrier signal
TXD Yellow Transmitted data
RXD Yellow Received data
RA Red Remotely detected problem with link
MA Red Memory function for problem with link
LO Green Link operation correctly
LA Red Locally detected problem with link
Sync Green Used when synchronization is selected
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