Epson MP-2100 TH manual Bit Images And Graphics, Graphic Commands Examples, Bit graphics

			User’s Manual
Bit Images And Graphics
ASCII	Dec	Hex	Description
ESC $ n1 n2	36	24	Fill in blank bit columns, from the actual column until column number
			(n1+n2*256), where n1+n2*256<=576.
ESC * ! n1	42 33	2A 21	24-bit graphics. Programs bit image for 24 bits, in double density
n2 b1...bn			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.
ESC K n1	75	4B	8-bit graphics. Selects the “8 pin” bit image (compatible with
n2 b1...bn			matrix printers) where you use n1+n2*256 columns, with 1 byte
			per column thus using a lower resolution and up to 576 columns.

Graphic Commands Examples

24-bit graphics

1st byte

2nd byte

3rd byte

1stbit-

column

8th bit-

column

MSB (bit 7)

LSB (bit 0)

Figure 12

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.

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

1st bit-column

8th bit-column

MSB (bit 7)

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.

LSB (bit 0)

Figure 13

22