Olympus AU2700 - Manual (Page 31)

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(2) Class B: with ACK/NAK protocol.
A. Sending
Text to be sent:
T.R.I. Inquiry text
Repeat Run T.R.I. Inquiry text
Start of Test Result Transmission text
Test Result text
Repeat Run Result text
End of Test Result Transmission text
ACK ACK
Received Received
Block end (BCC)
Initial Start
Condition of Transmission text
Text
Text end (BCC)
NAK NAK
Received Received
1 st time: resending the same block or or
2 nd time: sending the next block Time-out Time-out
1 st time: resending the same text
2 nd time: return to initial condition