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Section 7: Downloading Characters and Fonts
Count Count is the number of bytes of data being downloaded
starting with the font ID byte. The count is a 2-byte value
downloaded as the low byte followed by the high byte.
Font ID Byte The font ID byte is a 1-byte number that identifies the
font. The ID byte for the 249x is 35 (x23).
Start When downloading character data, the start address is
the absolute address of the start of the character data.
When downloading lookup table data, the start address is
the address of the new entry in the lookup table. The start
address is a 2-byte hexadecimal value downloaded as the
low byte followed by the high byte.
Data When data is character data, it comes from the character
design. When downloading lookup table data, data is as
follows:
Bit Bit Values Functions
1, 2, and
3 (Attribute
Byte 1)
The absolute address of the character's
image data.
7
1
Indicates that this is a block graphic
character (connects at 6 LPI).
6 0
Indicates a downloaded character.
1
Indicates a resident character.
5-0 The number of
character data dot
columns stored in
memory.
4 (Attribute
Byte 2)
7, 6
0,0
Shading character. The type of block graphic character.
0,1
Line drawing
character.
The type of block graphic character.
1,0
Underscore
character.
The type of block graphic character.
1,1
Not supported. The type of block graphic character.
5-0 For a 10 cpi Letter
Quality 36 column
character, bits 5-0
would be 35.
The number of dot columns of character
data printed minus one.