CHAPTER 5
VERTICAL FORMAT UNITS
Introduction
The P9012 printer includes four vertical format units: 1) Printronix standard Electronic Vertical Format Unit (EVFU), 2) Dataproducts Direct Access Vertical Format Unit (DVFU), 3) Direct Access Vertical Format Unit (NVFU), and 4) Centronics Direct Access Vertical Format Unit (CVFU). Although not a •true" VFU, a vertical tab table is provided for forms control in Serial Matrix protocol. All VFUs are available only in
n | General VFU Programming | n NVFU |
n | EVFU | n CVFU |
n | DVFU | n Serial Matrix Vertical Formatting |
General VFU Programming
A vertical format unit provides an efficient way to slew paper rapidly during repetitive printing tasks. The type of VFU used is a configuration option selected from the control panel. If not used, the VFU option should be disabled from the control panel.
The general VFU programming procedure is as follows:
1.Design a form, determining spacing and channel assignments for each line.
2.Send the programming sequence to the host. The sequence depends on the type of VFU used.
Some VFUs require the PI line normally associated with the Dataproducts parallel interface. Note that data bit 8 of the standard
The following information applies when programming and using a Vertical Format Unit:
Elongated Characters - Elongated (double high) characters can be used within VFU proF grams. The VFU automatically counts one line of elongated characters as two normal characF ter lines.
Paper Runaway Protection - If the VFU is selected but not loaded when a VFU command is sent from the host computer, the printer will move the paper a single line feed. If the VFU is selected and the memory has been loaded, a channel code sent from the host, which is not a part of the assigned sequence currently in memory, will move the paper a single line feed.
Line Spacing - The printer can use any line spacing with the VFU. The VFU determines the forms length according to the program specifications and the currently selected line spacing.
Vertical Format Units |
