Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 105)

Message Packet Formats
Chapter 5
5-26
Enter Download Mode
This command puts the PLC-2 processor into the Download mode. Use
this command on a PLC-2 station before attempting to send any physical
write commands to the station.
Command Format:
Reply Format:
TNS STS CMD
07
SRC DST
TNS STS CMD
47
SRC DST
FNC
04
When you send an Enter Download/Upload mode command, the
Industrial Terminal port is disabled until you send an Exit
Download/Upload mode command. When the Industrial Terminal port is
disabled, it enters the Mode Select State. To leave this state, you will
have to manually select a mode at the Industrial Terminal.
If you are using a 1771-KA, Series A, Revision F module, or a 1771-KG,
Series A, use the {Enter Download Mode} Command 07, Function 04,
shown above, before sending physical read commands.
If you are using a 1771-KA2 module, or a 1771-KG, Series B, use the
Enter Upload Command 07, Function 06, shown in the next section,
before sending physical read commands.