Program Interface Library AR_EXECUTE_BIT
CEI-100/CEI-200/CEI-x20 User’s Manual 76
AR_BIT_EXT_LOOPBACK Same as AR_BIT_INT_LOOPBACK,
but an external loopback is executed
instead. A properly-connected loopback
adapter must be externally attached.
All built-in-test operations (with the exception of AR_BIT_PERIODIC) re-
initialize the board, and should therefore only be used at startup. Built-
in test operations that re-initialize the board return failure if the board is
open in multi-process mode (if supported) and more than one process
has loaded the board. Refer to the documentation of
AR_SET_PRELOAD_CONFIG for a discussion of multi-process
limitations.
All loopback testing operations support balanced ARINC 429 channels
only, as described above. All ARINC 573/717, ARINC 561, and CSDB
channels are excluded from loopback testing. To test an ARINC
573/717 channel, refer to the sample application tst717.c (included with
the CEI-x20 software distribution). To test a CSDB channel, refer to the
CSDB API Wrap example. To test an ARINC 561 channel, refer to the
CEI-x20 Wrap example.
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