Table 2- 4 3964(R) Protocol - Siemens Simatic S7-300 CP 341 User Manual

Basic Principles of Serial Data Transmission
2.8 Configuration data
Protocol
The table below describes the protocol.
Table 2- 4 3964(R) protocol
Parameters Description
Default values are assigned to the protocol parameters.
3964 with default •
values and no
If the CP 341 recognizes the string DLE ETX, it stops receiving
•
block check
and sends a DLE to the communication partner if the block was
received error-free, or an NAK if an error occurred.
Default values are assigned to the protocol parameters.
3964R with default •
values and block
If the CP 341 recognizes the string DLE ETX BCC, it stops
•
check
receiving. The CP 341 compares the block check character (BCC)
received with the length parity calculated internally. If the BCC is
correct and no other receive errors have occurred, the CP 341
sends the DLE character to the communication partner (the NAK
character is sent if an error occurred).
The protocol parameters can be freely assigned by the user.
3964 assignable •
without block
If the CP 341 recognizes the string DLE ETX, it stops receiving
•
check
and sends a DLE to the communication partner if the block was
received error-free, or an NAK if an error occurred.
3964R assignable • The protocol parameters can be freely assigned by the user.
with block check
If the CP 341 recognizes the string DLE ETX BCC, it stops
•
receiving. The CP 341 compares the block check character (BCC)
received with the length parity calculated internally. If the BCC is
correct and no other receive errors have occurred, the CP 341
sends the DLE character to the communication partner (the NAK
character is sent if an error occurred).
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CP 341 Point-to-Point Communication, Installation and Parameter Assignment
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Default value
3964R with default values
and block check:
Character delay time =
220 ms
Acknowledgment delay time
= 2000 ms
Connection retries = 6
Transmission retries = 6
Manual, 09/2008, A5E02191071-01