Digi NS9750 - Manual (Page 729)

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Warning:
The NS9750 cannot proceed to the Host Busy Data Available protocol state
directly from negotiation state. If the host software supports the 1284
protocol reverse idle and interrupt host states (events 7, 18 – 20), the
impact is a one-time loss of approximately 2,000ns at the beginning of
data transfer. If the host does not support these states, however, the
NS9750 will be unable to transmit data in nibble or byte mode. Note that
there is no impact for a host that fully implements IEEE 1284.