Printronix P9000 Series, User'S Reference Manual, Page: 88 / 334

Vertical Format Units 5-8
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 lights when the DVFU program has been
enabled and loaded. Sending an appropriate channel code to the printer will cause 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. For a data byte to be recognized as a DVFU channel inĆ
struction, the following criteria must be met:
1. PI line must be enabled and set high; and
2. Data bit 5 must be 0 (not set).
Given these conditions, the lower 4 bits of a byte will specify the DVFU channel number.
Table 5-5 lists DVFU channels and their equivalent data bytes.
Clearing the DVFU Memory
The following actions will reset (clear) the DVFU memory.
1. Only start load and end load codes are sent (no channel assignment data).
2. An odd number of DVFU characters (channel assignment data) are sent (detected after
the end load code is received). Remember, two data bytes are required per line.