Plus RS-232 Manuale Utente Pagina 224

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Detailed Flowcharts
Appendix D
D20
Figure D.25
XMSG
Subroutine
XMSG
GETBUF
Check Availabil-
ity
of Receive Buffer
Clear CRC
Accumulator
GETCODE
Get a Code
Link
Data
?
Save
Byte
in Buffer
GETCODE
Get Next Code
Return An
Ignore Flag (0)
Link Data
No
Yes
Return
an ACK
GETBUF
SENDNET
Save New Header
Compare Mes-
sage
with HEADER
A
DLE ETX
?
Message
Too Small
No
Yes
BCC = 0
Re-
turn
a NAK
11678
No
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Yes
No
No
Yes
Yes
Yes
No
No
No
Yes
Output Flag
ACK if Message Is OK
NAK if Message Is in Error
0 if Message Is to be Ignored
Try to Get Another Buffer
Send Link Data to
Network Layer
Duplicate
Message
?
Did Buffer
Overflow
?
Was Buffer
Available
?
Error Flag
?
Buffer
Available
?
Buffer
Overflow
?
Code =
Station No.
?
A
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