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When the system is not idle control has to be explicitly granted to the requesting node by
the node currently in control. Sequence of operation:
• User presses the switch correlated to the node he is at
o Transfer of control is requested
o Green LEDs start blinking to indicate that a node is requesting control
Note: There is a timer which is started when a node requests control. The request expires
when this timer times out. The timer is set by the “Node Crtl request timeout (Secs)” variable
on the Job Details page. The timer can have any value between 30 and 60 seconds.
Scenario 3: Controlling node surrenders control without passing it to a requesting node
If requests are pending and the controlling node loses control without passing it (by
pressing it’s own button or being disconnected) the current requests are cleared. Sequence
of operation:
• Controlling node loses control without passing it
o Control reverts to first come first serve
o Green LEDs turn OFF on all the node switches that were requesting control
• User presses the switch correlated to the node he is at
o Control is automatically granted (see the Figure Switch adder showing idle
system at Scenario 1)
o Green LEDs turn ON solid to indicate which node is control
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