Diagnostic Retries; Initial Arbitration Count - adept technology GadgetGateway User Manual

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GadgetGateway Serial Interface

4.10 Redundant Twin Conﬁguration

>>>3

Enter New Auto Sync Time

in milliseconds >>>

Enter the new Auto Sync Time and press ENTER. The new value will appear in the menu.

Hit Enter without typing a number and the previous value will be retained.

This sets the time period in milliseconds between automatic synchronization attempts

from the twin to the inactive twin. The default is 5000 ms.

4.10.45 Diagnostic Retries

Select [4] from the menu and press ENTER.

>>4

Enter New Fault Retries Count >>>

Enter the new number of fault diagnostic retries and press ENTER. The new value will

appear in the menu. Hit Enter without typing a number and the previous value will be

retained.

This sets the number of retries that the active diagnostic interrogation request/response

message will use. A diagnostic is sent out each interface (709 and IP) whenever a monitor-

ing failure occurs. If the interrogation packet fails after Diagnostic Retries retries then a

fault of the associated network interface will have been deemed to have occurred. This

will generate and alarm. The default is 2 retries. If spurious faults occur it may be because

the diagnostic retries is too low and the diagnostic responses are getting lost due to colli-

sions. The odds of lost packets due to collisions decreases signiﬁcantly for retry counts

above 4.

Select [5] from the menu and press ENTER.

>>>5

Enter New Default Count >>>

Enter the new number for the initial arbitration count and press ENTER. The new value

will appear in the menu. Hit Enter without typing a number and the previous value will be

retained.

The Arbitration Count is a 64 bit number. The redundant twins use an arbitration count

encapsulated in the monitoring packets to determine which of the pair should be active.

The twin with the highest count wins the arbitration and goes active while the one with the

lower count will go inactive. If both have the same count then they both pick random

counts until one wins the arbitration.

On boot up both routers will default to active. The ensuing arbitration will result in one of

the routers going inactive. This menu option can be used to guarantee that a particular

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