45
Configuring the short range fibre optical
modem
Chapter 8
Configuring the digital
communication modules
2
Configuring the short range fibre optical modem
No setting is available for the short range fiber optical modem on the HMI. There are
however some 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 8. After the fibres
has been disconnected, if attached, the cover plate can be removed just by pulling at the
middle of the cover plate.
Figure 8: Setting and indications for short range optical modem
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.
Note!
If handled carefully the cover plate can be removed also with the fibres attached.
Fibre optic
connectors
Cover
plate
On
Off
TXD
CTS
RTS
MA
LA
Sync
RXD
DSR
DCD
RA
LO
Sync
1
2
3
4
Reset
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