Printronix P3000 Series - Manual (Page 83)

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
Clearing the DVFU Memory
Following one of these actions resets (clears) the DVFU memory.
•
Sending only the start load and end load codes (no channel assignment data).
•
Sending an odd number of DVFU characters (channel assignment data). (The printer de-
tects the characters after it receives the end load code.) Remember, two data bytes are re-
quired per line.
•
Sending a second start load code, which reinitializes the DVFU. (This restarts the host data)
•
Sending the first byte (after the start load) that does not specify top–of–form.
The DVFU data is ignored if the DVFU has not been selected from the control panel. Deselecting the
DVFU returns the forms length to the previously set value and the current print position becomes the
top–of–form.
Relative Line Slewing
Another method of moving paper using the PI line results in vertical slews of a specified number 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. The 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.