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Chapter 2. ANSI Emulation GEK-00029B
42
ELECTRONIC VERTICAL FORMAT UNIT - EVFU
Downline vertical tab loading is accomplished through the EVFU. The
EVFU allows loading a form table with a minimum form length of
.33 inches (240 decipoints) and a maximum length of 24 inches
(17,280 decipoints).
Since the maximum length is 24 inches, the number of lines is
dependent on the lpi setting. 3 lpi = 72 lines. 4 lpi = 96 lines.
6 lpi = 144 lines, and 8 lpi = 192 lines. Exceeding the maximum
causes a fault.
Downloading the EVFU
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The vertical format type must be set to VtType:Emul VFU through
the control panel using the Program Mode.
▪
No paper instruction lead (PI) is required.
▪
When the printer has an EVFU table loaded, VFU is displayed on
the control panel.
ESC ] ! Start EVFU table loading sequence
. Each line of the form requires
an entry. Dummy values (filler codes - See Table of Channel Codes on
page 5-30) are required in lines with no channel. Two bytes are
required for each line of the form. Loading Is terminated by the ESC \
sequence.
Decimal: 27 93 33
Hex: 1B 5D 21
BASIC: CHR$(27);"]!";
Loading the Table
The first table location is normally 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 form feed 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 code is:
Bit Number 8 7 6 5 4 3 2 1
Channel Numberxone654321
First Byte xoneyyyyyy
Bit Number 8 7 6 5 4 3 2 1
Channel Number x one 12 11 10 9 8 7
Second Byte xoneyyyyyy
y: 0 = no stop in channel
1 = stop in channel
x: bit has no meaning