When a command with an answer parameter is normally received ( unit ) and an answer is abnormallyreceived ( host )Command TransmittedCCPC0PC1PC2PCnBCCSTXETXSTXNAKAnswer TransmittedError Check OKHOSTUNITACPC0PC1PCnETXBCCRCSTXAnswerRetransmittedACPC0PC1RCError Check NGMAX40msMAX40msMAX40ms