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Bit Images And Graphics
ASCII
Dec
ESC $ n1 n2
36
ESC * ! n1
42 33
2A 21
n2 b1...bn
ESC K n1
75
n2 b1...bn
Graphic Commands Examples
24-bit graphics
1
st
byte
2
byte
nd
3
byte
rd
Figure 12
The command sequence to print this graphic pattern would be (numbers in decimal):
ESC * ! 8 0 1 1 1 2 2 2 4 4 4 8 8 8 16 16 16 32 32 32 64 64 64 128 128 128
Where you have 8 + 0 * 256 = 8 bit-columns to be filled, each with 3 bytes that will give us a total of 24 bytes
to be sent (excluding the command sequence).
8-bit graphics
1 byte
Figure 13
22
Hex
Description
24
Fill in blank bit columns, from the actual column until column number
(n1+n2*256), where n1+n2*256<=576.
24-bit graphics. Programs bit image for 24 bits, in double density
where n1+n2*256 is the number of bit-columns that will be sent
(see below) and b1...bn are the bytes that compose the bit image.
For each column one may need 3 bytes to complete. So, if you need
to send an image with an 8-column width you may send 24 bytes to
fill those columns. A full line has 576 bit columns so a full line will
need 576*3 = 1728 bytes.
4B
8-bit graphics. Selects the "8 pin" bit image (compatible with
matrix printers) where you use n1+n2*256 columns, with 1 byte
per column thus using a lower resolution and up to 576 columns.
1
st
bit-
column
8
bit-
th
column
MSB (bit 7)
LSB (bit 0)
1
bit-column
st
8
bit-column
th
MSB (bit 7)
LSB (bit 0)
For this 24-bit graphic pattern we have eight bit-
columns, each with a height of 3 bytes (24 bits). The
printer must, after the command is stated, receive the
1st , 2nd and 3rd bytes of the first bit-column, than
the 1st , 2nd and 3rd bytes of the second bit-column
and so on, until the last bit-column is filled.
For this 8-bit graphic pattern we have eight bit-columns,
each with a height of 1 byte (8 bits). The printer must,
after the command is stated, receive the byte for the
first bit-column, than the byte for the second bit-column
and so on, until the last bit-column is filled. The
resolution is lower but needs less bytes to be sent to
the printer.
User's Manual
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