Set Low Power State On; Enable Cursor - NCR 7454 Hardware User's Manual

6-10 Chapter 6: NCR 7454 4x20 Customer Display
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Description:
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Description:
The Screen Save feature may be in force during the Display On state.
This means that after about five minutes of no new display activity, the
Screen Save feature could take over and cause the display to go blank
or begin walking from right to left.

Set Low Power State On

1B 06
This state is used to reduce Retail VFD power consumption and extend
the life of the Retail VFD. Power is only removed from the VFD and the
display will not be refreshed. The Retail VFD controller is still fully
operational and will continue to accept commands. This command
causes the firmware to blank or turn off the Retail VFD. Display data
can be processed while the display is in the Low Power state, but it will
not appear until the Low Power state is changed. The displayed
character(s) states is preserved so that upon leaving the Low Power
State the display is restored. To leave the Low Power State, one of the
other state commands must be received. This is the default state for the
Retail VFD after power‐up.

Enable Cursor

1B 07
This command causes a flashing cursor to be used whenever the
Display On state is in force. When the cursor is enabled, the firmware
will show a visible flashing cursor at the current cursor position. The
flashing cursor should be visible for one second and then the character
at the cursor position should be visible for one second. The effect is to
alternate between the character and the cursor. The cursor is defined as
character 5FH of whatever character set is currently chosen. For the
two supported character sets, the cursor is the bottom row of pixels
turned on. For a user defined character set, the cursor will be whatever
is defined as character 5FH of the character set. When the cursor is
enabled, it overwrites the character at the cursor position. If the cursor
is disabled, the character at the cursor position is left visible.