Chapter 8: Horizontal Control Commands 75
The distance represented by the tab (distance from the center of one dot to the center of the
next dot) depends on the character pitch in effect when the printer receives the HT command,
as follows:
Table 52: MML ESC ETX Command —
Shift Increment for Character Pitches
Pitch Increment of Shift
10 cpi 1/120"
12 cpi 1/144"
15 cpi* 1/180"
17.1 cpi 1/206"
20 cpi 1/240"
Proportional 1/120"
* 15 cpi applies only to ML520 and ML521.
The tab information must be entered as four-digit ASCII numbers separated by commas, and
must be in ascending order. For tab values less than 1000, enter a zero for the x, y and/or z
digits as appropriate.
For example, suppose you want to set tabs by dot columns at 1/2", 2", 4", and 6" from the left
margin, using 12 cpi pitch. From the table above, at 12 cpi pitch, each dot produces a shift of
1/144". So, to move over 1/2" from the home position (0001, or 1/144"), the value would be
0071 ([1/2 x 144 dpi] - 1); for 2", the value would be 0287; for 4", 0575; and for 6", 0863. To
set these tabs enter the BASIC statement
LPRINT CHR$(27);CHR$(3);"0071,0287,0575,0863";CHR$(13)
Here are the maximum values for x
n
y
n
z
n
w
n
for each pitch and printer model:
Table 53: ML ESC ETX Command —
XYZW Values for Setting Horizontal Tabs
Maximum xyzw Maximum xyzw
Pitch ML320 ML520 ML321 ML521
10 cpi 0959 0960 1631 1632
12 cpi 1151 1152 1956 1956
15 cpi* N/A 1440 N/A 2448
17.1 cpi 1643 1644 2795 2796
20 cpi 1917 1920 3261 3264
* 15 cpi applies only to ML520 and ML521.
Note: Using the maximum value for the x
n
y
n
z
n
w
n
tab setting may not leave enough room
between the tab stop and the right margin for a full character to print.
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