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100-88002 Rev B Page 77
Horizontal Motion Control
Several commands can be used to control the horizontal position of characters. Many
applications use space control to position fields. However, the Epic 880
TM
Printer has
the ability to control character position with horizontal tab stops. This is done using
the horizontal tab [HT] to move to those tab stops.
[HT] Horizontal tab
ASCII [HT]
Hexadecimal 09H
Decimal <9>
IPCL &%HT
EPOS [HT]
Description The [HT] command inserts spaces in the print buffer up to the next tab
stop. The default tab locations are every eight spaces.
[BS] Back space
ASCII [BS]
Hexadecimal 08H
Decimal <8>
IPCL &%BS
EPOS [BS]
Description The [BS] command moves the print buffer one character width to the left.
The pointer position cannot be moved to the left of the left margin. [BS] does not
cause the buffer to be printed; rather, the following data is OR’ed with the previous
data.
[ESC] D Set horizontal tab stops
ASCII [ESC] D <n
1
> <n
2
> <n
3
> ... <n
i
> 0
Hexadecimal 1BH 44H <n
1
> <n
2
> <n
3
> ... <n
i
> 00H
Decimal <27> <68> <n
1
> <n
2
> <n
3
> ... <n
i
> <0>
IPCL none
EPOS [ESC] D <n
1
> <n
2
> <n
3
> ... <n
i
> 0
Description The [ESC] D <n
1
> <n
2
> <n
3
> ... <n
i
> 0 command sets tab stops at the
character columns specified by <n>. The end of the settings is specified by a <0>. All
previously set tabs will be cleared. Column sizes are in accordance with the current
character pitch. Setting tabs that are beyond the station width is possible. A [CR] is
inserted when the tab is used. Printing begins at the home position. The power up
default is every eight spaces, i.e., 9, 17, 25, and so on; use the restore-default
procedure [ESC] R to set these default tabs rather than re-specify the tabs.