Sending with the 3964(R) procedure
The gure below illustrates sending with the 3964(R) procedure.
W = 1
3964
G
2
3
G
DLE
W + 1
G
5
DLE
STX
x = 1
x + 1
G
x <= 6
x > 6
x <= 6
x > 6
3964R
Send DLE,
ETX
Intention to
send
Send STX
Start TADT
Start TADT
Send BCC
Wait for DLE
acknowledg.
Sendileted
T > TADT,
Send NAK
T > TADT,
Send NAK
BCC only with 3964R
x = setup attempt count
TADT = 500 ms (3964R TADT=2s)
W = transmission attempt count
Immediate return to initial state at line break (BREAK)
Send NAK
Wait for DLE
acknowledg.
character except
DLE, STX or
invalid
High
priority
Low
priority
Send block,
poss.
duplicate DLE
Receipt not
permitted
character except
DLE or invalid
character
Figure 2-15 Flow diagram of sending with the 3964(R) procedure
C: Counter for connection attempts
R: Counter for retries
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
40 Equipment Manual, 03/2022, A5E00057742-AE
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