Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 225)

Detailed Flowcharts
Appendix D
DĆ15
Figure D.16
TXALLOC Subroutine
10086-I
TXAL-
LOC
UART
In Use
?
Set IN–USE
Flag
RETURN
SLEEP
Wait at TXALWT
Until UART is Free
Indivisible Zone
Common:
•
IN–USE Flag
•
TXALWT: A Sleep Variable
N
o
Yes
11667
Figure D.17
TXFREE Subroutine
10087-I
TXFREE
Reset IN–USE
Flag
WAKEUP
Continue
Any
Process at
TXALWT
RETURN
Common:
•
IN–USE Flag
•
TXALWT: A Sleep Variable