Printronix P9000 Series, User'S Reference Manual

Page: 89 / 334

5-9 Vertical Format Units
Table 5-5. DVFU Channel Instruction
ASCII Channel
Hex
00
01
02
03
04
05
06
07
08
09
0A
0B
PI 7 6 5 4 3 2 1
1
1
1
1
1
1
1
1
1
1
1
1 X
X
X
X
X
X
X
X
X
X
X
X X
X
X
X
X
X
X
X
X
X
X
X 0
0
0
0
0
0
0
0
0
0
0
0 0
0
0
0
0
0
0
0
1
1
1
1 0
0
0
0
1
1
1
1
0
0
0
0 0
0
1
1
0
0
1
1
0
0
1
1 0
1
0
1
0
1
0
1
0
1
0
1 1
2
3
4
5
6
7
8
9
10
11
12
Dec
1
0
2
3
4
5
6
7
8
9
10
11
X = Undefined, 0 or 1 1 = High 0 = Low
8
X
X
X
X
X
X
X
X
X
X
X
X
Data Bits
NUL
SOH
STX
ETX
EOT
ENQ
ACK
BEL
BS
HT
LF
VT
Code
3. A second start load code is received, resulting in reinitialization of the DVFU. This allows
the host data to be restarted.
4. The first byte sent after the start load does not specify top-of-form.
The DVFU data is ignored if the DVFU has not been selected from the control panel. DeseĆ
lecting the DVFU returns the forms length to the previously set value and the current print
position becomes the top-of-form (TOF).
Relative Line Slewing
Another method of moving paper using the PI line results in vertical slews of a specified numĆ
ber of lines within the form relative to the current print line (rather than slewing to a specific
line). For this to occur, three criteria must be met:
1. PI line must be set high;
2. Data bit 5 must be 1 (set); and
3. The DVFU must be the selected Vertical Format Unit.
The Slew Relative configuration and the status of data bits 1-4 determine the number of lines
slewed as described in Table 5-6. (Note that the state of data bit 5 is the difference between
line slewing and using the interface lines as DVFU channel codes.) As long as the DVFU is
selected, this type of vertical paper motion will occur regardless of whether the DVFU memory
is loaded or not.
If the Double High for One Line attribute is active, n + 1 lines will be slewed rather than n lines.