NCR 5977 2x20 Display Programming 5-35
Erase Display
Format
1B 02
Description
This command clears all of the displayed characters by writing a space to each display
position. A space is defined as character 0x20 of the current character set. The cursor
moves to the 0 position.
Invalid Command
Format
1B 03
Description
This is now an invalid command.
Set Diagnostic State
Format
1B 04
Description
This state is exclusive from the On and Low Power states. This command causes the
firmware to display the current NCR firmware part number of the device (for example,
the current firmware part number for the device is 497–0408199) for five seconds and
then step through each installed 256–character set (default and user defined) displaying
one character at a time on all 40 display positions at a rate of about one character per
second. Start with the currently selected character set and then display all of the
characters from the other sets the same way. This continues until one of the other state
commands is performed. Prior display data is saved and can be restored be sending the
Turn On (state 3) command.
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