NCR Customer Display NCR 5972 - Manual (Page 43)

Chapter 4: Programming Set Up 4-13
Brightness Adjustment
Format: 1B 17 nn
Range: 01 ≤ nn ≤ 05
Description: Adjusts the brightness of the entire display.
Individual characters or display positions are not adjusted. On
power up, the default brightness setting is 5 (100%).
Nn Brightness
01 20%
02 40%
03 60%
04 80%
05 100%
Note: This command is not supported by the LCD. The only
action taken is to take the display out of Screen Save.
Read Display ID Byte
Format: 1B 18
Returns: 0x8A
Description: This command is a request for the Retail Display to
return an identifier. The Retail Display returns one byte (0x8A) that
identifies the Retail Display as a 2x20 with 7x9 dot matrix.