REV.-A
Figure 2-20 shows the basic sequence for the carriage operation.
●
C. H.P.S. (Refer to Section 2.4.5.3)
When the printer is initialized, a carriage home position seek is performed. Then the carriage motor
enters the holding mode at the operation start position (START).
●
Rt
At least 6 ms of rush time
is set just before acceleration and after deceleration to stabilize the
motor operation. It takes 75 ms for the carriage motor to restart from the stop mode.
●
Acceleration mode
The acceleration mode consists of a maximum of 12 steps, and the time period for each step becomes
shorter as the step number increments. In the acceleration mode, the CPU checks the home position
signal each time the phase is switched, and a carriage error occurs if the home position signal goes
HIGH.
●
speed mode
.
After acceleration completes, the carriage motor enters the constant speed mode. Printing is started
when the carriage motor enters this mode. The time period for each step is the same, 2.22 ms at
450
and 1.11 ms at 900
●
Deceleration mode
The deceleration mode consists of a maximum of 12 steps. The time period for each step becomes
longer as the step number increments.
The 450
speed (l-1 phase drive) is used for printing NLQ characters, and the 900
speed (2-2
phase drive) is used for printing Draft characters. The patterns for the phase switching and the time
data are contained in the working area of the RAM. The CPU uses this data as a reference table, and
outputs the phase data to the E05A03 in accordance with the timing of the character to be printed.
XX07H write operation)
2-25
