Receiving with the 3964(R) Procedure
The gure below illustrates receiving with the 3964(R) procedure.
Receiving with procedure 3964(R) (part 1)
Character not equal to STX or faulty
character
Send request
NAK or BREAK
Waiting for character
time delay
Send NAK
Initialization conflict, own
priority low
STX received after
expected repeat
Yes
Add waiting time to free
receiving buffer
No
Has waiting time of 400
ms expired ?
No
Send NAK
Send DLE
Is receiving buffer
free ?
Waiting 50 ms
Figure 2-17 Flow diagram of receiving with the 3964(R) procedure (part 1)
R: Counter for retries
D: Default state
Basic Principles of Serial Data Transmission
2.5 Data Transmission with the 3964(R) Procedure
Point-to-point connection CP 440 Installation and Parameter Assignment
Equipment Manual, 03/2022, A5E00057742-AE 43
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