Printronix P9000 Series, User'S Reference Manual

Page: 96 / 334

Vertical Format Units 5-16
5. Bit 7 is low during the CVFU load.
6. A second start load code is received, resulting in reinitialization of the NVFU. (This alĆ
lows the host data to be restarted.)
When the CVFU memory is cleared, the forms length returns to the previously set value and
the current print position becomes the top-of-form (TOF).
Relative Line Slewing
Another method of moving paper using the PI line results in vertical slews of a specified numĆ
ber of lines within the form relative to the current print line (rather than slewing to a specific
line). For this to occur, three criteria must be met:
1. A 1F hex code must have been received;
2. Data bit 5 must be 1 (set); and
3. The CVFU must be the selected Vertical Format Unit.
The Slew Relative configuration and the status of data bits 1-4 determine the number of lines
slewed as described in Table 5-12. (Note that the state of data bit 5 is the difference between
line slewing and using the interface lines as CVFU channel codes.) As long as the CVFU is
selected, this type of vertical paper motion will occur regardless of whether the CVFU memory
is loaded or not.
If the Double High for One Line attribute is active, n + 1 lines will be slewed rather than n lines.