Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario Pagina 132

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Half-Duplex Protocol
Chapter 11
115
Figure 11.1
Formats
for Half-Duplex Protocol
DLE ENQ STN BCC
a) Polling Packet
CMD STS FNC ADDR DATA
DST SRC CMD STS TNS
Data
(From Application Layer)
DLE STX
Data
(From Network Layer)
DLE ETX
BCC
b) Slave Message Link Packet
From
Application
Layer
From
Network
Layer
From
Application
Layer
From
Network
Layer
CMD STS FNC
ADDR
DATA
DST SRC CMD STS TNS
Data
(From Application Layer)
DLE SOH STN DLE STX
Data
(From Network Layer)
DLE ETX
BCC
c) Master Message Link Packet
10051–I
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