Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 215)

Detailed Flowcharts
Appendix D
DĆ11
Figure D.12
SENDTX Subroutine
11665
SENDTX
TXALLOC
Allocate UART
or Wait
SEND
Transmit DLE
SEND
Transmit ETX
SEND
Transmit CRC
Low Byte
Zero Out Any
Previous Response
Code at RESP
SEND
Transmit CRC
High Byte
TXFREE
Deallocate
UART
RETURN
Input
•
CRC
Common
•
RESP: The Response Code Variable