6-16 Chapter 6: NCR 7454 4x20 Customer Display
Display ESC Character
(Not a supported command)
Format: 1B 1B
Description: This command is a request for the ESC character to be displayed to the
current cursor position.
Select Character Set n
Format: 1B 20 - 1B 21
Description: This set of command chooses one of the two supported internal
character sets. Character set 1 is defined as Page 1(International),
character set 2 is defined as Page 2(Japanese). Character set selection is
dynamic. Host software can switch between character sets at any time.
Switching between sets does not erase or change the display. This
means characters from multiple character sets may be on a display. The
default character set is Page 1(International).
Read Display Data String
Format: 1B 38
Returns: 0x50, "xxx---------xxxxx"
Where 0x50 is a 1 byte string length indicator which indicates the length
of the string that follows the string length indicator. For example, 50H
characters are sent after the string length indicator. Note: The quotation
marks “” are not part of the string and are not returned.
Description: This command is a request for the Retail VFD to return an ASCII string
which are being displayed on the Retail VFD.
