
Asynchronous Link Protocols
Chapter 4
4-34
Figure 4.22
Duplicate Message T
ransmission
xxxx
xxxx
OK
Not Full
SINK MASTER LINK SLAVE SINK
11572
DLE ACK
SOURCE/ SOURCE/
BCCDLE ENQ STN
DLE STX xxxx DLE ETX BCC
BCCDLE ENQ STN
DLE STX xxxx DLE ETX BCC
Not Full
DL ??? CK
Sometime Later ...
(Discard Retransmission)
Figure 4.23
Message Sink Full, Case 1
Full
OK
xxxx
xxxx
SINK MASTER LINK SLAVE SINK
11573
DLE ACK
SOURCE/ SOURCE/
BCCDLE SOH STN
DLE EOT
BCCDLE ENQ STN
Not Full
Sometime Later ...
(Timeout)
DLE STX xxxx DLE ETX
BCCDLE SOH STN DLE STX xxxx DLE ETX
No Message
Not Full
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