Intermec Janus 2020 Reference Manual - Im_Decrease_Contrast

im_decrease_contrast

3-16

im_decrease_contrast

Purpose:

This function decreases the LCD display contrast by one level. The display

contrast is the lightness or darkness of the characters against the reader

display. The reader display has 32 levels of contrast (0 to 31).

Syntax:

With Intrmecd_IO, Intrmecp_IO;

Use Intrmecd_IO, Intrmecp_IO;

function im_decrease_contrast return System.Word;

Parameters:

None.

Return Value:

This function returns one of the standard status codes listed in Appendix A,

“Status Codes.”

Notes:

The 0 to 31 scale fine-tunes the contrast more precisely than using the

keypad to adjust the contrast.

The functions im_set_contrast and im_get_contrast use a scale of 0 to 7 that

is related to the scale of 0 to 31 used by im_increase_contrast and

im_decrease_contrast. The following table shows the equivalent values for

the 0 to 7 scale.

Scale 0 to 7

Scale 0 to 31

Level

0

10

Very light

1

12

2

14

3

16

4

18

5

20

6

22

7

24

Very dark

This function has no effect on the JANUS 2050.

See Also:

im_increase_contrast, im_set_contrast, im_get_contrast