Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario Pagina 141

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Half-Duplex Protocol
Chapter 11
1114
Figure 11.5 shows a message transfer in which the BCC was invalid.
After a timeout, the message is retransmitted. After the retransmission the
response is DLE ACK.
Figure 11.5
Message
T
ransfer with Invalid BCC
Not Full
OK
xxxx
xxxx
SINK MASTER LINK SLAVE SINK
1005–I
DLE ACK
DLE STX ??? DLE ETX BCC
SOURCE/ SOURCE/
DLE SOH STN
DLE STX xxxx DLE ETX BCCDLE SOH STN
(Timeout)
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