Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 100)

Message Packet Formats
Chapter 5
5-21
Note that the interface module at the receiving PC station executes this
command by first making a copy of the addressed PC byte. It then sets or
resets the appropriate bits and writes the byte back into PC memory. At
the same time, the PC processor can be changing the states of the original
bits in memory. Because of this, some data bits may unintentionally be
overwritten.
Command Format:
Reply Format:
TNS STS CMD
05
SRC DST
TNS STS CMD
45
SRC DST
ADDR
Up to 60 Masks of This Form
SET RESET
Unprotected Read
This command reads words of data from any area of PC data table
memory. Use the SIZE field to specify the number of bytes to be read.
To specify a number of PC words, SIZE should be an even value because
PC words are two bytes long.
Command Format:
Reply Format:
TNS STS CMD
01
SRC DST
TNS STS CMD
41
SRC DST
ADDR
DATA — Max. of 244 Bytes
SIZE