Printronix P3000 Series - Manual (Page 82)

Vertical Format Units 5–8
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 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 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 Byte First 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 buffer to print and
slew the paper to the next line on the form having the specified channel number assigned in DVFU
memory. To 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. Table 5–5
lists DVFU channels and their equivalent data bytes.