Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 182)

Message Formats
Appendix A
AĆ20
Where the extended status byte is optional.
A PLC–3 receives privileged commands from an RS–232–C device (such
as a computer); the PLC–3 does not send these commands. The
privileged commands are:
privileged read download request
privileged write upload request
diagnostic counters reset restart request
diagnostic loop set ENQs
diagnostic read set NAKs
diagnostic status set timeout
Privileged Read
Use this read command with a PLC–3 physical address as a starting
address. You use this command to upload from a PLC–3 to a computer.
The destination 1775–KA module will accept this command only after the
source station has successfully transmitted a shutdown request. The
function code for this command is 9.
Command Format:
DLE SRC C
0
S TNS MD
F
TS TNS STX FNC
09
SIZE DST DLE ETX BCC PLC-3
physical address
Reply Format:
TDATA–Max of 238 bytes or 119 words DLE ETX BCChis is the same
as the reply packet format for all reads.
A. Format when the command was successfully executed
DLE C S TNS MD TS TNS STX DLE ETX BCC DATA - Max of 244 bytes or 122 words DST SRC
4F
B. Format when reporting an error
DLE SRC STX DST C
4F
S TNS
MD TS TNS DLE ETX BCC ETX
STS
Where the extended status byte is optional.
Privileged Commands