50
Configuring the short range fibre optical
modem
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The module can also synchronize received data with the send clock. This is not normal-
ly necessary in this application. Synchronization ON/OFF is controlled by switch 2,
which shall normally be set in OFF position. When the module is set for synchroniza-
tion (switch 2 = ON) switch 1 must be set in the position corresponding to the Sync LED
that is brightest. If both have the same brightness the switch can be set in any position.
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There are also some jumpers on the circuit board that have to be correctly set. One, S4
according to figure
, is for changing the functionality between article number
1MRK 001 370-BA delivered with version 1.1, 1.2 and 2.0.(marked 1MRK001471-
BA) and 1MRK 001 370-DA delivered with version 2.3 and higher (marked
1MRK001471-DA). The difference between these two is that the transmitted and re-
ceived signal is inverted in one compared to the other.
When a terminal of version 1.1, 1.2 or 2.0 is to communicate with a terminal of version
2.3 or higher it is necessary that the jumper is changed to 1 MRK 001 370-BA in the
version 2.3 terminal. This is due to that older versions of this module lacks the possibil-
ity to set article number, they are fixed set at 1 MRK 001 370-BA. If both terminals
however include modules with possibility to change article number it actually doesn’t
matter what article number is used as long as the same number is used in both terminals.
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OFF
OFF
Timing created by the modem
OFF
ON
Timing recovered from received optical signal
ON
OFF
Timing created by the MPM module
ON
ON
No timing, the data transmission will not work
Summary of Contents for REL 531
Page 16: ...10 Note signs KDSWHU 6DIHW LQIRUPDWLRQ ...
Page 44: ...38 Checking the binary I O circuits KDSWHU KHFNLQJ WKH H WHUQDO FLUFXLWU ...
Page 52: ...46 Checking the self supervision signals KDSWHU QHUJLVLQJ WKH WHUPLQDO ...
Page 140: ...134 Testing the interaction of the distance protection KDSWHU 7HVWLQJ WKH SURWHFWLRQ V VWHP ...
