ijpds formats.book - Kodak

Set Position (SPX)
Byte Position Bytes Field Name Description
Chapter 4. Record Formats
Set Position (SPX)
The SPX record sets the starting position at a specific point on the page.
The next printed line or space will start at this position. The X and Y
coordinates in this record identify a starting position relative to the current
origin. The origin is set to 0,0 by SDC, SOD, SOP, WFC, and CSR and to
the current cursor position by SOR.
When the starting position is set, the top left corner of the first character in
the next printed line will be at that position. Printed lines and spaces
subsequent to this record continue in the direction of the current font.
Refer to Chapter 1 for a discussion of font direction.
The effect of the SPX record will continue until another SPX, SPO, SRP,
or CSR record, a start of page record (SOP or WFC), or a start of
document record (SOD or SDC) is received. The top of page X,Y position
of 0,0 is set by each SOP, WFC, SOD, CSR, and SDC record.
This record performs in the same manner as the SPO record. The only
difference is that the SPX record has 32-bit X and Y fields so that larger
numbers can be specified.
1-2 2 Record Length The length of this record, in binary, including the record length field.
For example, hex 00 0C specifies a record length of 12 bytes.
3 1 Cyclic Record Count A binary cyclic record count using modulo 256. Each record in the
job is counted, starting with hex 01 for the first record. The 255th
record is hex FF and the 256th record is hex 00. This count is used
to verify record sequence.
4 1 Control Code A binary code that identifies the record type. A value of hex 3C
identifies the SPX record.
5-8 4 X Position A signed binary number representing the X coordinate value in dots
relative to the current origin. Negative values are represented using
the two's complement form. For example, hex 00 00 19 00
specifies an X value of 6400 dots and FF FF E7 00 specifies an X
value of -6400 dots. The useful range is printer dependent and also
dependent upon the current cursor origin. Refer to Chapter 1 for a
description of X position.
9-12 4 Y Position A signed binary number representing the Y coordinate value in dots
relative to the current origin. Negative values are represented using
the two's complement form. For example, hex 00 00 8C A0
specifies a Y value of 36000 dots and FF FF 73 60 specifies a Y
value of -36000 dots. The useful range is printer dependent and
also dependent upon the current cursor origin. Refer to Chapter 1
for a description of Y position.
The following illustration shows how the starting position set by an SPX
record is used by the different font orientations.
Reference Guide 4 - 33