NIM Primitives
4-5
TIWAY 1 Ti505 NIM User Manual
An exception procedure is used when the addressed device finds fault with:
The value of the Length field
A Primitive format
A data element type
The execution of a Primitive
If a fault is found with the Length field, Primitive format, data element type or in the
execution of the Primitive, the exception reason is returned with the Exception Primi-
tive, which is Primitive Code 00.
4.3.2
Exception When Reading
The device performing the Primitive operation aborts execution of a Primitive when an
exception condition is encountered, and returns the reason for the exception. The device
requesting the Primitive should evaluate the message returned, take appropriate cor-
rective measures, and attempt to retransmit the Primitive.
4.3.3
Exception When Writing
When an Exception Primitive is returned in response to a Write Primitive (P/C write,
NIM block or record configuration, change state, etc.) you should verify that the actions
were actually performed. You may have to send the Primitive again, since all, none, or
part of the Primitive may have been executed prior to the failure. The station sending the
Primitive should examine the exception reason, take appropriate corrective measures,
and try to send the Primitive again.
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