Chapter 9: Vertical Control Commands 93
Table 64: IBM/Epson n/360" Line Spacing Commands —
Values of Parameter n
Emulation Values of n
IBM 1 to 255
Epson 0 to 255
Whenever a value of zero is assigned to n, the line spacing command will be ignored.
Set Vertical Units (IBM)
⻬ ML390 Turbo, ML391 Turbo ⻬ ML590, ML591
Function ASCII Dec Hex
Set Vertical Units ESC [ \ 4 0 0 0
0 0 n
27 91 92 52 48 48 48
48 48 n
1B 5B 5C 34 30 30 30
30 30 n
This command defines the vertical spacing units used by the ESC 3 n command in the IBM
emulation (described above), as follows:
Table 65: IBM ESC [ \ Command —
Values of Parameter n
Values of n Spacing Unit
180 1/180"
216 1/216"
Vertical Tab Commands
When you turn your printer on, it doesn't have any vertical tab stops. Sending a VT command
with no stops set will produce a single line feed.
The commands described below are used to set vertical tab stops. In the Epson and
MICROLINE Standard emulations, you have the option of entering a single set of vertical tab
stops or of using the electronic Vertical Format Unit (VFU) to program multiple sets of vertical
tabs, called channels. The IBM emulation permits you to enter one set of stops, but does not
have the VFU feature.
The actual position of the stops depends on the line spacing in effect when you send the
command. For example, at 6 lines per inch, a tab stop of 24 will appear four inches from the
top of the page, whereas at 8 lines per inch, the stop will be positioned three inches from the
top of the page. However, once you've set the vertical tab stops, their position is absolute, and
won’t move, even if you later change the line spacing.
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