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5.1.6 Set backlight brightness (254 153 [brightness])

This command sets the display’s brightness to [brightness], where [brightness] is a value between 0x00

and 0xFF (between 0 and 255). The higher the number is, the brighter the backlight will appear.

5.1.7 General purpose output on (254 87)

This command turns ON the general purpose output. ON means that the output is pulled low or, ground

via 240ohms.

5.1.8 Read module type

This command will return, over the RS-232 interface in TTL levels only, the model type value of the

module. This command returns a 1-byte hex value. Values for various modules at the time of this publication

are as follows;

Table 7: Module Values

LCD0821 - 0x01 LCD2021 - 0x03 LCD2041 - 0x05

LCD4041 - 0x07 LK202-25 - 0x08 LK204-25 - 0x09

LK404-55 - 0x0A VFD2021 - 0x0B VFD2041 - 0x0C

VK204-25PC - 0x0E VK204-25 - 0x0F GLC12232 - 0x10

GLC24064 - 0x13 GLK24064-25 - 0x15 GLK12232-25 - 0x22

LK404-AT - 0x31 LK402-12 - 0x33 LK162-12 - 0x34

6 Appendix; Command Summary

6.1 General

The operation of the display is controlled by a simple and consistent command set. Commands control;

• Text

• Display graphics

• Display keypad interface

• Miscellaneous operating parameters

6.2 Issuing Commands

Commands are issued to the display by the controller. In a test setup, commands can be issued to

the display by means of a BASIC program, using the chr$( ) function. In the tables below, we’ve shown

Matrix Orbital LCD2041 20

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 32 33

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