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
