Epson TM-300A Operator's Manual page 42

The bit image modes selectable by m are as follows:
l
Vertical Direction
m
Number of
Vertical Dots
0 8
1 8
[Notes] If m is out of range, the data following n1 (and the data includ-
l
ing n1) is processed as normal data.
After printing a bit image, the printer returns to normal data
l
processing.
The relationship between the image data and the dots to be
l
printed is as follows:
ESC 2
Set 1/6 inch line spacing
[Name]
[Format] <1B>H<32>H
[Description]
Sets the line spacing to 1/6 of an inch.
E S C 3 n
[Name] Set line spacing using minimum units
[Format] <1B>H<33>H<n>
0 n
[Range]
[Description] Sets the line spacing to n/144 inches.
[Default] n = 24 (1/6 of an inch)
Horizontal Direction
Horizontally
Dot
Density Adjacent Dots
Single density Printable
Double density Unprintable
255
36
Total Number
of Dots
200
400