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Vertical Format Units5–8
CH
12 BOF
– The last channel 12 loaded is used as the Bottom–of–Form (BOF) channel and has sig
-
nificance when using the printer skip–over perforation feature. When skip–over perforation is en-
abled,
paper skips from BOF to T
OF
only
if at the BOF position. If a channel search moves paper past
the BOF position but before the TOF position, no skip–over perforation will occur.
Table 5–4. DVFU Channel Assignment
Channel #Bit #
6
5
4
3
2 – VT
1 – TOF
6
5
4
3
Channel #
2
1 (LSB)
12 – BOF
11
10
9
8
7
8
7
X (don’t care)
Second Data ByteFirst Data Byte
Bit #
8
7
6
5
4
3
2
1 (LSB)
X (don’t care)
X (don’t care)X (don’t care)
Value Value
Binary Binary
128
64
32
16
8
4
2
1
128
64
32
16
8
4
2
1
End Load Code – 6F Hex
The
DVFU end load code is 6F (hex) with the PI line high. This terminates the
DVFU memory load
routine.
Using the DVFU
The
VFU LOADED indicator on the control panel glows when the
DVFU program has been enabled
and
loaded. Sending an appropriate channel code to the printer causes any data in the buf
fer to print
and
slew the paper to the next line on the form having the specified channel number assigned in DVFU
memory.
T
o recognize a data byte as a DVFU channel instruction, the following criteria must be met:
1. The
PI line must be enabled and set high; and
2. Data bit 5 must be 0 (not set).
Given
these conditions, the lower four bits of a byte will specify the DVFU channel number
. T
able 5–5
lists
DVFU channels and their equivalent data bytes.