Olympus AU2700 - Manual (Page 32)

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B. Receiving
Test to be sent:
T.R.I. text
Repeat Run T.R.I. text
End of T.R.I. Transmission text
ACK ACK
Send Send
Block end (BCC)
Initial Start
Condition of Transmission text
Text
Text end (BCC)
NAK NAK
Send Send
1 st time: receiving the same block
2 nd time: receiving the next block
1 st time: receiving the same text
2 nd time: return to initial condition