Read Display Id Byte; Read Display Id String; Display Esc Character; Select Character Set N - NCR 7454 Hardware User's Manual

6-16 Chapter 6: NCR 7454 4x20 Customer Display
Format:
Returns:
Description:
Format:
Returns:
Description:
Format:
Description:
Format:

Read Display ID Byte

1B 18
0x8E
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

1B 19
0x1D, ʺNCR_008‐0221552,_F/W_V1.00.01ʺ
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.
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)
1B 1B
This command is a request for the ESC character to be displayed to the
current cursor position.

Select Character Set n

1B 20 - 1B 21