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5-7Vertical Format Units
Start Load Code - 6C, 6D, or 6E Hex
6E
Hex
- The D
VFU start load code of 6E (hex) with the PI line high initiates the D
VFU
mem
Ć
ory
load routine using the current printer line spacing as the D
VFU line spacing.
6C
Hex
- The D
VFU start load code of 6C (hex) with the PI line high initiates the D
VFU mem
Ć
ory
load routine using 6 lpi as the line spacing regardless of the current printer line spacing.
6D Hex - The DVFU start load code of 6D (hex) with the PI line high initiates the DVFU
memory
load routine using 8 lpi as the line spacing regardless of the current printer line spac
Ć
ing.
Channel Assignment
Following the start load code, all data bytes received are interpreted as channel assignment
data until the end load code is received. During the channel assignment portion of the load
routine,
the PI line can be high
or low; if high, however, the channel data must
not
be the same
as
start or end load code data. The last channel 12 loaded is assigned Bottom of F
orm (BOF). If
skip-over
perforation is enabled, slewing will occur from BOF to TOF
.
A
maximum of 12 channels can be assigned
to one physical line on the form (multiple channels
per
line facilitate the use of
a single D
VFU load for multiple forms). T
wo eight-bit data bytes
(DVFU
characters) are required per line. As shown in T
able 5-4, the least significant 6 bits of
the first data byte are used to assign channels 1 through
6; the least significant 6 bits of the sec
Ć
ond
data byte are used to assign channels 7 through 12. If a bit is set,
the corresponding channel
is
assigned.
Each line on the form requires two bytes. For lines not requiring a channel identification, the
two
bytes should not contain channel assignments.
A
maximum of 143 lines (286 D
VFU bytes) can be assigned on the form. If more
than 286 bytes
are received without an end load code, the end load code is forced" and the load routine is
terminated.
CH
1 TOF
- The first
channel, line 1 of the form,
must
be assigned channel 1, top-of-form, or
the entire load sequence is ignored and the memory reset. Consequently, when preparing to
load
the D
VFU memory, position the paper at the required top-of-form position in anticipa
Ć
tion
of sending the TOF channel assignment code as the first line loaded. After the memory is
loaded, a Form Feed code (FF, 0C hex) will move the paper tothe next channel 1 (top-of-
form).
CH
2 VT
- Channel 2 is designated as the vertical tab channel. After the memory is loaded, a
VT
code (0B hex) will move the paper to the next channel 2. If a VT code is received but chan
Ć
nel
2 is not loaded, the paper will advance a single line at the current line spacing.
CH 12 BOF - The last channel 12 loaded is used as the bottom-of-form channel and has
significance when using the printer skip-over perforation feature. When skip-over perforaĆ
tion is enabled, paper will skip from BOF to TOF only if at the BOF position. If a channel
search
moves paper past the BOF
position but before the TOF position, no skip-over perfora
Ć
tion
will occur.