Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 77)

Asynchronous Link Protocols
Chapter 4
4-34
Figure 4.22
Duplicate Message Transmission
xxxx
xxxx
OK
Not Full
SINK MASTER LINK SLAVE SINK
11572
DLE ACK
SOURCE/ SOURCE/
BCC DLE ENQ STN
DLE STX xxxx DLE ETX BCC
BCC DLE 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/
BCC DLE SOH STN
DLE EOT
BCC DLE ENQ STN
Not Full
Sometime Later ...
(Timeout)
DLE STX xxxx DLE ETX
BCC DLE SOH STN DLE STX xxxx DLE ETX
No Message
Not Full