User`s manual

Software Manual • EKF Intelligent I/O Controller Family On CompactPCI
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When sending a message to the controller it is important to note, that neither the contents of
IMR0 nor the parameter or data buffers should be altered until the controller responds by
writing a reply message to OMR0. This is best done by using a semaphore flag that
indicates, when set, that the MU is currently in use. Before writing to the MU test and set the
flag. When the controller responds with a reply message (RPL flag set), the semaphore can
be cleared.