Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 184)

Message Formats
Appendix A
AĆ22
Command Format:
FNC DLE SRC STX DST C
0F
S TNS
MD TS TNS DLE ETX BCC
07
Reply Format:
A. Format when the command was successfully executed
DLE SRC STX DST C
4F
S TNS
MD TS TNS DLE ETX BCC
B. Format when reporting an error
ETX
STS
DLE SRC STX DST C
4F
S TNS
MD TS TNS DLE ETX BCC
Where the extended status byte is optional.
Download Request
A computer can use this command to inform the 1775–KA module that it
wants to do a download. If the 1775–KA module grants the download
privilege, the computer may begin issuing privileged writes. You should,
however, issue a shutdown command first. If a different station already
has the download privilege, the second station is denied the privilege.
The function code is 5.
Command Format:
FNC DLE SRC STX DST C
0F
S TNS
MD TS TNS DLE ETX
BCC
05