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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
1st time: resending the same block or or
2nd time: sending the next block Time-out Time-out
1st time: resending the same text
2nd time: return to initial condition