Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 218)

Detailed Flowcharts
Appendix D
DĆ14
Figure D.15
TXALLOC Subroutine
TXALLOC
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
No
Yes
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Figure D.16
TXFREE Subroutine
TXFREE
Reset IN-USE
Flag
WAKEUP
Continue
Any
Process at
TXALWT
RETURN
Common
•
IN-USE Flag
•
TXALWT: A Sleep Variable
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