Loading the table – Printronix ANSI Printer User Manual
Page 67
Loading the Table
67
The EVFU allows loading a table with a minimum form length of .33 inches
(240 decipoints) and a maximum length of 22 inches (15,840 decipoints).
Since the maximum length is 22 inches, the number of lines is dependent on
the LPI setting. 3 LPI - 66 lines, 4 LPI - 88 lines, 6 LPI - 132 lines, and 8 LPI -
176 lines. Exceeding the maximum causes a fault.
The EVFU can be loaded using ANSI ESC sequences, or by using the paper
instruction (PI) line. The following pages describe the use of the EVFU without
using the PI line.
ASCII Code ESC ]!
Hex Code
1B 5D 21
Dec Code
27 93 33
Expression CHR$(27);“]!”
Loading is terminated by the ESC \ sequence.
Loading the Table
The first table location is always loaded with the channel 1 code. This is
defined as the top of form (TOF) channel. The table may be left without
channel 1 and a command to skip to channel 1 will cause a normal formfeed
as though there were no VFU.
Two bytes are loaded for each line of the form to be controlled. One or more
channel numbers may be indicated in the two byte code.
The format of two byte channel control codes is shown in Table 22.
NOTE: To make characters acceptable, bit 7 must be set.
Table 22. Two Byte Channel Control Code Format
Bit Number
8
7
6
5
4
3
2
1
Channel Number
x
x
6
5
4
3
2
1
first byte
x
x
y
y
y
y
y
y
Bit Number
8
7
6
5
4
3
2
1
Channel Number
x
x
12
11
10
9
8
7
second byte
x
x
y
y
y
y
y
y
y: 0 - no stop in channel, 1 - stop in channel
x: bit has no meaning