Printronix P6000L, User'S Reference Manual

Page: 86 / 234

Vertical Format Units 5-2
PART NUMBER
VENDOR
PART NAME
ADDRESS
QUANTITY
PHONE NUMBER
DAVFU CHANNEL
5
2
6
FORM DATA
7
3 and 8
FORM
4 and 10
LINE #
1
2
3
4
5
6
7
8
9
10
11
12
1 and 12 (Top of Form)
Figure 5-1. Sample DAVFU Form Design
Start Load Code - 6E Hex
The DAVFU Start Load code is 6E (hex) with the Paper Instruction line (PI) high. This initiĆ
ates the DAVFU memory load routine. Subsequent data received is considered channel assignĆ
ments until the End Load code is received. The PI line is a hardware interface signal that is held
either high or low. Refer to the Interface chapter for PI and Data Line pinout information.
Alternatively, a Start Load Code of 6C or 6D hex may be used in place of 6E hex. When 6C is
used as the Start Load Code, line spacing will be 6 lines per minute (lpi). When 6D is used as the
Start Load Code, line spacing will be 8 lpi. When the standard 6E is used, line spacing is not
changed.
Channel Assignment
Following the Start Load code, all data bytes received are interpreted as channel assignment
data until the End Load code is received.
A maximum of 12 channels can be assigned to one physical line on the form. Two eight bit data
bytes (DAVFU characters) are required per channel assignment. Lines that have no channel
assigned also require two identifying bytes. As shown in Table 5-1, the least significant 6 bits of
the first data byte are used to assign channels 1 through 6; the least significant 6 bits of the secĆ
ond data byte are used to assign channels 7 through 12.