Xerox WORKCENTRE 7120 Manual de referencia - Página 8

Navegue en línea o descargue pdf Manual de referencia para Impresora Xerox WORKCENTRE 7120. Xerox WORKCENTRE 7120 29 páginas. Color networking mfp a3
También para Xerox WORKCENTRE 7120: Manual del evaluador (25 páginas), Manual del evaluador (24 páginas), Manual de referencia (30 páginas), Especificaciones (14 páginas), Especificaciones (14 páginas), Comparación de la competencia (11 páginas), Comparación de la competencia (11 páginas), Folleto y especificaciones (4 páginas), Manual de uso rápido (20 páginas), Manual de uso rápido (20 páginas), Manual de uso rápido (20 páginas), Manual de uso rápido (20 páginas), Manual de instalación (2 páginas), Manual de instalación (2 páginas), Manual de uso rápido (20 páginas), Manual de referencia (32 páginas), Manual del administrador del sistema (20 páginas)

Imprimir página
Xerox WORKCENTRE 7120 Manual de referencia
2. FUNCTIONAL DEoSCRIPTION·
DATA REPRESENTATION
A single 80-column card can contain data in either of two
formats: EBCDIC or binary.
EBCDIC CARD FORMAT
In the EBCDIC card format there are 256 val id punch con-
figurations for a single card column (see Appendix A), each
of whi ch is translated into an 8-bit code in the range 0-
25510(0016-FF16). Thus, the EBCDIC card image (i.e.,
the 80 columns of punch configurations) consists of a trans-
lated string of 8-bit bytes, with the first byte of the string
corresponding to the configuration punched in column 1 and
the last byte of the translated string corresponding to col-
umn 80. , The card image is always presented to the control-
ling system in column order.
Figure 1 illustrates how the first two columns of an EBCDIC
card image are presented to the controll ing system. Note
that column 2 contains an invalid EBCDIC punch configura-
tion, which is translated as 8 zeros and which causes a trans-
mission data error condition (see IErrorConditions" in Chapter
3).
If column 1 of a card contains punches in rows 1 and 2,
the entire card is interpreted as a binary card image rather
than an EBCDIC image (see IIRead Orders" in Chapter
3).
Column
Byte
II
)
000000000
12345118 B
1111111111
2122222222
3333333333 \
444444444
555555555
6666666661
777777777
8888888888
9999999999 }
1 2 3
~
5 6 1 8 9 10
~I
l
n+1
n
,
,
f A ,
Data
11 1 00 0001
1.
0000 0000
I
Bit Position
0
1
2
314
5
6
710
1
2
314
5
6
7
Validity
Valid
Invalid
Figure 1. EBCDIC Read Operation
2
Functional Description
BINARY CARD FORMAT
In the binary card format there are 4096 possible punch con-
figurations for a single card column, and all configurations
are valid. In this format each card column corresponds toa
12-bit code in the range 0-4095 (00016-FFF16)' with each
row punch corresponding to a 1 in the
12-bit code. Thus,
the binary card image consists of a string of 80 12-bit codes,
with the first code corresponding to the actual punch con-
figuration in column 1 and the last code corresponding to
the actual punch configuration in column 80.
Because
Sigma I/O systems use an8-bitbyte as the basic data group-
ing, the 80 12-bit codes are presented to the control
I
ing
system as 120 8-bit bytes.
Figure 2 illustrates how the first twocolumnsof a binary card
image are presented to the controll ing system.
Note that
for odd-numbered columns, the data in rows 12 through 5
comprise one byte and that the data in rows 6 through 9 are
combined with the data in rows 12 through 1 of the next
even-numbered column to form a second byte. A third byte
is formed from the data in rows 2 through 9 of the even-
numbered column.
Thus, for each odd- even-numbered
pa ir of binary card columns, the controll ingsystem receives
a sequence of three 8-bit bytes.
Card Row
Column
Byte
Data
I
123456 )
1111111
2122222.
61666666L
rF
777777777
IF
818888888
123'; 5 6) 8 9
~
I
999999999
12 11
0
1
2
3
4
5.6
7
8
9 12 11
i
0
1 12
3
4
5
6
7
8
9
~~
______
T~
___
I __
~J ~~----~:~T,-------JI
n
:It
n+l
*
I
2
n+2
*
Bit Pos i t i on
'o-;--;-:;-tT-<"'"i:"--;-irn-,-:;-:;-i~;--;---:;4-;;--;;--::--:::-t...,......,~...".J
Figure 2.
Binary Read Operation
The binary card image is always presented to the controlling
system in column order and in the byte sequence described
above.