Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 107)

Message Packet Formats
Chapter 5
5-28
Physical Read
This command reads bytes of data from the PC data table or program
memory. Use this command to upload the contents of PLC-2 memory to
your computer.
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
04
SRC DST
TNS STS CMD
44
SRC DST
ADDR
DATA — Max. of 244 Bytes
SIZE
Physical Write
This command writes bytes of data into the PC data table or program
memory. Use this command to download the contents of a computer file
into PLC-2 memory.
Use the SIZE field to specify the number of bytes to be written. 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
03
SRC DST
TNS STS CMD
43
SRC DST
ADDR DATA — Max. of 242 Bytes