Ansi evfu – Printronix ANSI Printer User Manual
Page 66
66
Chapter
3
ANSI EVFU
ANSI EVFU
Rapid vertical paper movement is called slewing. A vertical format unit (VFU)
is a table, or program, of vertical tabs that enable the printer to slew paper to
preset locations on a page.
The preset locations are identified by codes, or channels. The first line
channel code defines the first line on the form; the second line channel
defines the second line on the form, etc. Each line must have a channel. Filler
channel codes are used for lines that will not be accessed by the print
program. Two bytes are required for each line of the form.
Any channel code can be used as a filler except channel code 1, which is
reserved for the top-of-form, and channel code 12, which is reserved as the
vertical tab channel. The same filler channel code can be repeated as
necessary for any number of lines.
Table 21. P-Series EVFU Line Slewing
ASCII
Data Bits
Lines
Slewed
Hex
Dec.
Code
PI
8
7
6
5
4
3
2
1
10
16
DLE
1
X
X
X
1
0
0
0
0
1
11
17
DC1
1
X
X
X
1
0
0
0
1
2
12
18
DC2
1
X
X
X
1
0
0
1
0
3
13
19
DC3
1
X
X
X
1
0
0
1
1
4
14
20
DC4
1
X
X
X
1
0
1
0
0
5
15
21
NAK
1
X
X
X
1
0
1
0
1
6
16
22
SYN
1
X
X
X
1
0
1
1
0
7
17
23
ETB
1
X
X
X
1
0
1
1
1
8
18
24
CAN
1
X
X
X
1
1
0
0
0
9
19
25
EM
1
X
X
X
1
1
0
0
1
10
1A
26
SUB
1
X
X
X
1
1
0
1
0
11
1B
27
ESC
1
X
X
X
1
1
0
1
1
12
1C
28
FS
1
X
X
X
1
1
1
0
0
13
1D
29
GS
1
X
X
X
1
1
1
0
1
14
1E
30
RS
1
X
0
0
1
1
1
1
0
15
1F
31
US
1
X
0
0
1
1
1
1
1
16
(X = Undefined, 0, or 1) (1 = High) (0 = Low)