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DATECS DPP-450 Programmer’s Manual

10. Selects ruled line buffer A (DC3 A)

Code: [13h] + [41h]

Makes ruled line buffer A active.

All DC3 commands for clearing or setting data use the active ruled line buffer. When ruled line is

enabled, then printing a line and commands DC3 P and DC3 p use this buffer.

By default buffer А is selected.

11. Selects ruled line buffer B (DC3 B)

Code: [13h] + [42h]

Makes ruled line buffer B active.

All DC3 commands for clearing or setting data use the active ruled line buffer. When ruled line is

enabled, then printing a line and commands DC3 P and DC3 p use this buffer.

By default buffer B is selected.

12. Clears selected ruled line buffer (DC3 C)

Code: [13h] + [43h]

Clears selected ruled line buffer (Sets all bits to 0).

After power on or command ESC @ both buffers are clear.

Entering or leaving ruled line mode (DC3 + and DC3 -) does not clear ruled line buffers.

13. Sets a single dot in selected ruled line buffer (DC3 D)

Code: [13h] + [44h] + nL + nH

Set to ‘1’ one bit of the active ruled line buffer.

The dot coordinates are nL+256*nH. Coordinates outside the printable area are ignored.

14. Ruled line pattern set (DC3 F)

Code: [13h] + [46h] + n1 + n2

The command fills the selected ruled line buffer with the data sequence n1, n2. Permitted

values: 0-FFh. Every byte sets 8 dots, last executed command DC2 = determines whether the MSB is

the left or the right side.

The existing data in the buffer are replaced with the new data.

Dots outside the printable area are ignored.

15. Ruled line line set (DC3 L)

Code: [13h] + [4Ch] + mL + mH + nL + nH

The command sets to ‘1’ the bits between to specified coordinates in the selected ruled line buffer.

The coordinates are mL+256*mH and nL+256*nH. The part of the line outside the printable area is

ignored.

16. Selects ruled line combine mode (DC3 M)

Code: [13h] + [4Dh] + n

The command selects the logical operation between the selected ruled line buffer and the print

buffer when ruled line is enabled. n is from 1 to FFh, but only the LSB is used:

0: OR operation – bit ‘1’ in ruled line buffer sets a black dot on paper.

1: XOR operation – bit ‘1’ in ruled line buffer inverts the dot.

For commands DC3 P, DC3 p and when printing an empty line the logical operation doesn’t matter.

Logical operation XOR is useful to invert the whole height of a text line (white letters on black

background).

By default OR mode is selected (value 0).

17. Ruled line one dot line print (DC3 P)

Code: [13h] + [50h]

The active ruled line buffer is printed as a single line (0.125 mm high).

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