Microscan QX Hawk Manuale Utente Pagina 407

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QX Hawk Industrial Imager User Manual A-91
Appendices
Error Condition 2
The protocol makes 3 retry attempts before data is flushed and transfer is aborted.
HOST_TX ‘RES’ ‘0x1C’ ‘REQ’ (Poll Unit 1 for data)
imager_TX ‘0x1C’ ‘STX’ <T/00000> ‘ETX’
HOST_TX Nothing’ (Host should ‘ACK’ here)
timeout reached...
imager_TX ‘REQ’ (Unit requests an ‘ACK’ again)
HOST_TX NAK’ (Host rejects data frame)
(Retry Event)
imager_TX ‘0x1C’ ‘STX’ <T/00000> ‘ETX’ (Unit sends again)
HOST_TX ‘ACK’ (Host receives data)
imager_TX ‘RES’ (Terminate Transfer 1)
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