Allen-Bradley 1779-KFMR User Manual page 124

Chapter 8
Enter Download Mode
The enter download mode 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:
Unless otherwise stated, values shown are in hexadecimal, and each block
shown represents one byte.
Enter Upload Mode
The enter upload mode command puts the PLC-2 processor into the
upload mode. Use this command on a PLC-2 station before attempting to
send any physical read commands to the station.
When you send an enter 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. In order to leave this state, you will have to manually select a mode
at the industrial terminal. If your industrial terminal (Cat. No. 1770-T3) is
Revision G or later, it will inform you if an upload is in progress.
Command Format:
Success Reply Format: