Xaar XJ128 Series, Руководство по эксплуатации

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XJ128 and XJ128 Plus Printhead
XJ128 Guide to Operation
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Xaar Document no: D031010302 Version A Page 31
6.2 Data structure
6.2.1 Configuration data structure
All XJ128 printhead models are configured and ready to operate following the power-on sequence.
No external printhead configuration is required.
6.2.2 Cycle order
Due to the
“ shared wall ” design it is not possible to eject nozzles from adjacent channels at the same
time. To overcome this, all the nozzles are divided/grouped into three
“ droplet ejection ” groups,
called cycles, as shown in the table 6.8.
Group Name Driving Group
A Cycle Nozzles in the range [(1+n*3)
… 126]
B Cycle Nozzles in the range [(2+n*3)
… 127]
C Cycle Nozzles in the range [(3+n*3)
… 128]
Table 6.8 - Nozzle grouping into cycles
The first firing nozzle is an
‘ A ’ cycle. The last firing nozzle is a ‘ B ’ cycle. If t
he printhead is used bi-
directionally, the order of firing is reversed for the return pass i.e. C-B-A by use of a
‘ phase order ’
signal, PHO, on the user interface.
The cycle order sequence is controlled by the user application through the interface connector. The
A-B-C cycle order is called the
” Normal cycle order ” and the C
-B-A cycle order is called the
” Reversed cycle order ” .
Figure 6.3
–
Cycle order when changing the cycle direction using
‘
PHO
’
With the PHO signal set at low level (inactive), the
“ Normal cycle order ” is used, which means that
the printing order of the groups is A-B-C. When the PHO signal is set at a high level (active), the
“ Reversed cycle order ” is used, which means that the
used printing order of the groups is C-B-A.
Start
“ Normal ” print direction
A
C B
Reset
Order
“ Reversed ” print direction
C
A B
Reset
Order
Start