ABB 500 Series Builder's Manual page 80

74
Configuring the 56/64 kbit data
communication modules
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 LEDs 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 is explained in table 37.
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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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