User`s manual

7–31Digital Emulation

Select Size Unit (SSU)

ASCII Code ESC [ Ps SP I

Hex Code 1B 5B Ps 20 49

Dec Code 27 91 Ps 32 73

Purpose Works with the Position Unit Mode (PUM) sequence to select a unit of

measurement for spacing parameters.

Discussion When PUM is enabled (set), Select Size Unit selects either decipoints or

pixels as the spacing unit, depending on the parameter settings shown

below.

If the printer receives an SSU while PUM is disabled (reset), the selected unit

will take effect when PUM is set and will then remain in effect until the

printer receives either another SSU or a reset sequence.

Default value at power–up or reset is decipoints. The printer will ignore all

Ps values other than 2 or 7.

Ps Spacing Unit

2 Decipoint (1/720 inch)

7 Pixel (1/600 inch)

The printer converts decipoints (D) into pixel (P) values by using the formula

shown below and rounding off the result to the nearest integer:

D x 5

P =

All arithmetic operations are performed using integer instructions. For

example, the formula above converts decipoints to the nearest pixel.

NOTE: If you select decipoint units, do not use horizontal position relative

(HPR) and vertical position relative (VPR) sequences. Using these

commands with decipoint units produces cumulative positioning

errors because they are rounded–off.