REV.-A
2 . 4 . 7
This section gives an outline of the software that controls the
the drive pulse width control,
and the drive circuit. The specifications of the
are as follows:
Number of solenoids
: Nine
Drive voltage
: +24 VDC
Coil resistance
: 19.2 ohms
drive pulse width: 360
(at 24 V,
2.4.7.1
Control
The data is output to the
in the following sequence:
2.
3.
4.
Print data is expanded in the image buffer as dot patterns. The CPU outputs the dot patterns to the
The data for pins 1 through 8 of the
is latched by HD 1 through
of the
XX04H write operation)
The data for pin 9 of the
(usually for underlining) is latched by
of the
via
DB7.
After latching the data, the
drive pulse width signal FIRE is output from the event counter
in the CPU. While the FIRE signal is LOW, the gate opens so that the data at HD 1 through
is
output.
The timing of the event counter in the CPU is set mechanically. The data write operation is completed
within one cycle of the counter. The operation described below is inhibited to protect the
from being damaged.
FIRE
Dot Pattern
Half
Dot
Pattern
time
Fig. 2-29.
Drive Pulse Pattern
Figure 2-29 shows the sequences for the normal and half dot printing, which can be performed at any
pin of the
Driving the
continuously to print adjacent half dots (the portion marked
●
in the above figure) is inhibited. If this pattern exists after expanding the image data, one dot will be
ignored.
2-32
