Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 174)

Message Formats
Appendix A
AĆ12
Unprotected Read
Use this command to read 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:
DLE SRC C
0
S TNS MD
1
TS TNS STX DLE ETX BCC ADDR SIZE
Reply Format:
DLE SRC C
4
S TNS MD
1
TS TNS ADDR STX DLE ETX BCC DATA - Max of 244 bytes
Unprotected Write
Use this command to write words of data into any area of PC data table
memory.
Command Format:
DLE SRC C
0
S TNS MD
8
TS TNS ADDR STX DLE ETX BCC DATA - Max of 242 bytes
Reply Format:
DLE SRC C
0
S TNS MD
1
TS TNS STX DLE ETX BCC