Siemens Simatic S7-300 CP 341 - Transmission Integrity; Figure 2-3 Position of the Supplied Protocols of the CP 341 in the Reference Model

Basic Principles of Serial Data Transmission
2.3 Transmission integrity
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01 35
2.3 Transmission integrity
Transmission integrity plays an important role in the transmission of data and in selection of
the transmission procedure. Generally speaking, the more layers of the reference model are
applied, the greater the transmission integrity.
Classifying the supplied protocols
The CP 341 can use the following protocols:
● 3964(R) procedure
● RK 512 computer link
● ASCII driver
● Printer driver
The figure below illustrates how these protocols of the CP 341 fit into the reference model:
RK 512
3964(R)
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(YHU\FRUUHFWO\UHFHLYHGFRPPDQG
PHVVDJHIUDPHLVDQVZHUHGZLWKD
UHVSRQVHPHVVDJHIUDPH
1RWSUHVHQWZLWKDSXUH
SRLQWWRSRLQWFRQQHFWLRQ
'DWDOLQNOD\HU
7KHGDWDE\WHVDUHWUDQVPLWWHGZLWK
56WDUWDQGVWRSELWVDUHDGGHG
LQWKHHYHQWRIDQHUURUWKHWUDQVPLVVLRQ
PD\EHUHSHDWHG
3K\VLFDOOD\HU
7KHSK\VLFDOWUDQVPLVVLRQRIWKH
GDWDE\WHVLVGHILQHG
3ULQWHUGULYHU
/D\HU
/D\HU
/D\HU
/D\HU
$6&,,GULYHU
Figure 2-3 Position of the supplied protocols of the CP 341 in the reference model
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