GLK12232-25-WB-E Datasheet GLK12232-25-WB-E | P28-P30

7.1.1 Clear display (254 88)

This command clears the display and resets the text write position to the top left of the screen.

7.1.2 Set contrast (254 80 [contrast])

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

0xFF (between 0 and 255). Lower values cause ’on’ elements in the display area to appear lighter, while

higher values cause ’on’ elements to appear darker.

Lighting conditions will affect the actual value used for optimal viewing. Individual display modules

will also differ slightly from each other in appearance. In addition, values for optimal viewing while the

display backlight is on may differ from values used when backlight is off.

7.1.3 Set contrast and save (254 145 [contrast])

This command works in exactly the same way as the "Set contrast" command. The only difference is

it saves the contrast value in the memory of the module, whereas the previous command only changes the

value for the duration of use.

7.1.4 Backlight on (254 66 [minutes])

This command turns on the backlight for a time of [minutes] minutes (this speciﬁes how long the back-

light will remain on after reception of the command). If [minutes] is zero (0), the backlight will remain on

indeﬁnitely.

NOTE Backlight is always on by default on power up.

7.1.5 Backlight off (254 70)

This command turns the backlight of the display off.

7.1.6 General purpose output on (254 86 [gpo #])

This command turns ON either of the general purpose outputs. [gpo #] is 1 for G1 or 2 for G2. Note that

ON means that the output is pulled low.

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7.1.7 General purpose output off (254 87 [gpo #])

This command turns OFF either of the General Purpose Outputs. [gpo #] is 1 for G1 or 2 for G2. For G1

OFF allows the output to ’ﬂoat’. For G2 OFF pulls the output to +5V.

7.1.8 Set I

C address 254 51 [address])

This command sets the I

C write address of the module. This value must be an even number and the

read address is one higher. For example if the I

C write address is set to 0x50, then the read address is 0x51.

The change in address is immediate. This address is 0x50 by default, and is reset temporarily back to that

value when the ’manual over-ride’ jumper is used on power up.

7.1.9 Read module type (254 55)

This command will return, over the RS-232 interface, the model type value of the module. It will return

a 1-byte hex value. Values for various modules at the time of this publication are as follows;

Table 9: Module Values

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

LCD4021 - 0x06 LCD4041 - 0x07 LK202-25 - 0x08

LK204-25 - 0x09 LK404-55 - 0x0A VFD2021 - 0x0B

VFD2041 - 0x0C VFD4021 - 0x0D VK202-25 - 0x0E

VK204-25 - 0x0F GLC12232 - 0x10 GLC24064 - 0x13

GLK24064-25 - 0x15 GLK12232-25-WBL - 0x22 GLK12232-25-SM - 0x24

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

LK204-25PC - 0x35

7.1.10 Set RS-232 port speed (254 57 [speed])

This command sets the display’s RS-232 port to the speciﬁed [speed]. The change takes place immedi-

ately. [speed] is a single byte specifying the desired port speed. Valid speeds are shown in the table below.

The display can be manually reset to 19,200 baud in the event of an error during transmission (including

transmitting a value not listed below) by setting the ’manual over-ride’ jumper on the display controller

board during power up. This command is ignored until this jumper is removed again.

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Table 10: Speed Settings

Speed Value Speed

20 Hex 9600 baud

0F Hex 19200 baud

95 Hex 57600 baud

03 Hex 76800 baud

8A Hex 115000 baud

7.1.11 Set Serial Number (254 52 [byte1] [byte2]

Modules may be delivered with the serial number blank. In this case the user may set the desired 2 byte

serial number using this one time only command.

Upon the execution of this command, the module will echo these two bytes back over the RS-232 inter-

face. The serial number may be set only once. Any future attempt to execute this command will result in no

change and the module will return to the originally set serial number.

7.1.12 Read Serial Number (254 53)

This command will return, over the RS-232 interface, the two-byte serial number of the module as it was

previously stored.

7.1.13 Read Version Number 254 54)

This command will return the ﬁrmware version number of the display. It will return a 1-byte hex value.

8 Appendix: Command Summary

8.1 General

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

Commands control;

• Text display

• Graphics display

• Keypad interface the display ﬁle system

• Miscellaneous operating parameters

This chapter includes summary tables of all commands.

Matrix Orbital GLK12232-25-WBL 26

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