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Downloadable Graphics Chapter 6

6-6 324M/424M Operator’s Manual - 880026-0144

6.5.4 Uncompressed FONT to RAM (^D104)

This command allows graphic and/or font images (fonts must be less than 64KB

uncompressed) to be transmitted in ASCII-HEX, thereby allowing all data to pass over 7 or

8-bit data connections. This command is usable on data connections that support either 7

or 8-bit data.

The following is the format of the ^D104 command when used for a graphic image file:

^A<Slot Number>^D104<CR>

Where:

<Memory Slot Number> is the memory slot location (1-255) where the graphic will be saved

in the printer’s memory. The printer uses the same TCI of “8” to select downloadable fonts

or graphics. Therefore a font and a graphic cannot have the same Slot Number or CGN

number.

<Rotation> is an 8-bit integer, 0 for an upright font, and 1 for a 90-degree rotated image.

<Count> is a 32-bit integer, least significant byte first. This is the number of bytes that the

image uses.

<Image Data> is the graphic image data that has been converted to ASCII-HEX.

ASCII-HEX Conversion

The ASCII-HEX conversion is performed by “OR’ing” the most significant and least

significant nibbles of every byte with “30” HEX.

For Example: To convert the byte “6C” to ASCII-HEX, simply OR the first and second

nibbles with “30” HEX. This results in the two bytes “36” HEX and “3C” HEX. This

conversion results in a file size that is twice as big as the source, the data can now be

transmitted over a 7-bit data connection.

Figure 6-1 ASCII-HEX Conversions

6 C

1 2 ... 126 127 128 129 130 131 132 133 134 135 136 ... 233 234

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Microcom 324M Manual del operador Pagina 131