Chapter 4:
Programming Set Up
Firmware
and
software
function
descriptions
for
the
NCR
5972
Retail
Display
are
presented
in
this
chapter.
Host/Retail Display Command Interface
The
Retail
Display
accepts
two
types
of
data:
display
data
and
command
data.
If
a
byte
received
from
the
host
is
any
character
except
the
ESC
(0x1B)
character,
it
is
processed
as
a
character
and
displayed
on
the
Retail
Display.
If
an
ESC
character
(0x1B)
is
received,
the
subsequent
byte(s)
is
processed
as
a
command.
If
the
subsequent
byte
is
an
invalid
command
it
is
ignored.
If
an
ESC
is
received,
but
no
command
byte
is
received
immediately,
the
firmware
waits
forever
if
need
be
and
uses
the
next
received
byte(s)
to
complete
the
command.
Note:
Each
command
consists
of
at
least
two
bytes.
The
first
byte
(0x1B)
is
a
command
identifier
indicating
the
next
byte(s)
is
a
command
byte.
The
command
byte
may
be
followed
by
parameter
or
data
bytes
depending
on
the
command.
Also
note
that
the
ESC
character
can
be
displayed
by
using
the
Display
ESC
Character
command.
Содержание 5972-1000
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