ABB REL 551 2.3 Series - Configuring the Short Range Fibre Optical Modem

49
Configuring the short range fibre optical
modem
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No setting is available for the short range fibre optical modem on the HMI. There are
however some settings that can be made on a DIP-switch located behind the cover
around the fibre optic connectors at the back of the terminal according to figure 11
. Af-
ter the fibres has been disconnected, if attached, the cover plate can be removed just by
pulling at the middle of the cover plate.
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Switch 3 and 4 are used to set the source of timing. The function is according to setting
of timing signal, table 2
. When using the modem for optical point-to-point transmission,
one modem should be set for locally created timing and the other for timing recovered
from received signal. When the modems are communicating with a transceiver 21-15X
or 16X the modems shall be set for timing recovered from received optical signal, see
setting of timing signal.
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Fibre optic
connectors
Cover
plate
On Off
TXD
CTS
RTS
MA
LA
Sync
RXD
DSR
DCD
RA
LO
Sync
1
2
3
4
Rese
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