Setting up and operating the BUC system
Block Up Converter Systems 6700/6900 series User Guide 77
Operating the redundancy system
If you are not using the contact closure inputs on the
Auxiliary I/O connector, the redundancy controller runs
automatically. You can manually switch streams by setting the
Online state of a BUC using a Hand-held Controller 6560 or
a PC connected to the BUC 1 Serial or BUC 2 Serial
connectors, or a Remote Controller 6570 connected to the
Auxiliary I/O connector.
If you want to exert external control via the contact closures
on the Auxiliary I/O connector (see Figure 14 on page 52)
you must:
1 Ground pin J.
This enables remote control.
1 Select Manual Mode by grounding pin N, or select Auto
Mode by not grounding pin N.
1 If Manual Mode was selected in the previous step, then
you may select Stream 2 by grounding pin G, or select
Stream 1 by not grounding pin G.
NOTE
External stream selection in Manual Mode
is independent of any faults.
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