HP L 5 manual Empty Row, Duplicate Row

For command byte values 0 - 3, the two <# of bytes/rows> bytes specify the number of bytes (row length) for the row. For command byte values 4 and 5, these bytes identify the number of empty or duplicate rows to print. The maximum value for these two bytes is 65,535; however, the image is clipped to the logical page. Thus, the value of these bytes should not exceed the maximum number of bytes/rows that can be printed on the current logical page size.

If an out-of-range command byte is encountered, the remainder of the block is skipped, the cursor is not updated, and the seed row is cleared.

Compression methods 0 - 3 are the compression methods used by the Set Compression Method command. Value fields 4 and 5 are features for the adaptive compression method and are explained below.

Empty Row

A command byte of 4, empty row, causes a row of zero’s to be printed. The number of rows printed depends on the value contained in the two <# of bytes/rows> bytes following the command byte. The empty row operation resets the seed row to zero and updates the cursor position.

Duplicate Row

A command byte of 5, duplicate row, causes the previous row to be printed again. The row can be duplicated the number of times indicated by the value contained in the <# of bytes/row> byte. Duplicate Row updates the cursor position but does not change the seed row.

6-30 Raster Graphics EN