Computer to pc communiation chapter 9 – Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual User Manual
Page 103

Computer to PC Communiation
Chapter 9
9Ć4
Figure 9.2
The Application, Network and Data Link Layer of RS-232-C Communication (Full or
Half-Duplex)
CMD
STS
FNC
ADDR
DATA
DST
SRC
CMD
STS
TNS
Data
(From Application Layer)
DLE
STX
Data
(From Network Layer)
DLE
ETX
BCC
Full Duplex Link Packet and Half–Duplex Slave 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
Half–Duplex Master Message Link Packet
10037–I
Data Link
Layer Packet
Data Link
Layer Packet
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