NCR 7454, Hardware User'S Manual

Page: 164 / 180

6-16 Chapter 6: NCR 7454 4x20 Customer Display
Read Display ID Byte
Format: 1B 18
Returns: 0x8E
Description: This command is a request for the Retail VFD to return a identifier. The
Retail VFD returns one byte (0x8E) that identifies the Retail VFD as a
4x20 with 5x7 dot matrix.
Read Display ID String
Format: 1B 19
Returns: 0x1D, ʺ NCR_008 ‐ 0221552,_F/W_V1.00.01 ʺ
Where 0x1D is a 1 byte string length indicator which indicates the
length of the string that follows the string length indicator. For
example, 1DH characters are sent after the string length indicator.
Note: “_”indicates a space character (20H). 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
with detailed product information.
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