Epson Stylus Pro XL+ [301/573] Sending bit image data to the printer

Epson Stylus 820 [301/573] Sending bit image data to the printer
R-70 Sending Graphics Data
Sending bit-image data to the printer
The order for sending data depends on the mode selected with the m parameter.
The table at the beginning of this section lists the number of bytes of data
required for each column.
Count the number of resulting columns in each line. The nL and nH parameters
tell the printer how many columns to expect. Calculate nL and nH as follows:
nH = INT
number of dot columns( )
256
nL = MOD
number of dot columns( )
256
If you are going to send more than one line of graphics, send the following
commands to set the line spacing:
24/48-pin printers ESC + 48 48/360-inch line spacing
9-pin printers ESC 3 24 24/216-inch line spacing
This matches the line spacing to the height of the print head. After this, sending
the CR and LF commands moves the vertical print position so the next line of
graphics begins right where the previous line ended, with no space between.
Now send the data for the first line to the printer as follows:
ESC * 0 nL nH d1 d2 . . . dk
ESC * 39 nL nH d1 d2 . . . dk
ESC * 72 nL nH d1 d2 . . . dk
1 7 13
2 8 14
3 9 15
4 10 16
5 11 17
6 12 18
1 4 7
2 5 8
3 6 9
1 2 3

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