Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 179)

Message Formats
Appendix A
AĆ17
Reply Format:
This is the same as the reply packet format for all writes.
A. Format when successful execution.
DLE SRC STX DST C
4F
S
TNS
MD TS TNS DLE ETX BCC
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.
File Read
Use this read command with either a file symbol or a block address for a
starting address. This starting address points to a file of words. This read
command reads a block of data. You must read the entire file. The file
size must equal the exact size of the file or an error will be returned. The
function code is 4.
Command Format:
A. File symbol address
DLE SRC C
0
S TNS MD
F
TS TNS STX FNC PACKET
04
DLE ETX BCC
00 SIZE
OFFSET
TOTAL
TRANS
00 DST
00 ASCII symbol
(8 characters max)
B. Logical address
DLE SRC C
0
S TNS MD
F
TS TNS STX FNC PACKET
04
DLE ETX BCC SIZE
OFFSET
TOTAL
TRANS
00 DST
PLC-3 logical address
(2-51 bytes)