Matrix-orbital LK162B-7T Manual de usuario descargar pdf (Pagina 24)

Command Summary 20

6.6 Keypad

6.1 Auto Transmit

Key Presses On

Dec

Hex

ASCII

254 65

FE 41

■ A

v5.0

Key presses are automatically sent to the host when received by the display. Default is Auto Transmit on.

6.2 Auto Transmit

Key Presses Off

Dec

Hex

ASCII

254 79

FE 4F

■ O

v5.0

Key presses are held in the 10 key buffer to be polled by the host using the Poll Key Press command. Use this

mode for I2C transactions. Default is Auto Transmit on.

6.3 Poll Key

Press

Dec

Hex

ASCII

254 38

FE 26

■ &

v5.0

Reads the last unread key press from the 10 key display buffer. If another key is stored in the buffer the MSB will

be 1, the MSB will be 0 when the last key press is read. If there are no stored key presses a value of 0 will be

returned. Auto transmit key presses must be turned off for this command to be successful.

Response

Byte

Value of key pressed (MSb determines additional keys to be read).

6.4 Clear Key

Buffer

Dec

Hex

ASCII

254 69

FE 45

■ E

v5.0

Clears all key presses from the key buffer.

6.5 Set Debounce

Time

Dec

Hex

ASCII

254 85

FE 55

■ U

Time

v5.0

Sets the time between a key press and a key read by the display. Most switches will bounce when pressed; the

debounce time allows the switch to settle for an accurate read. Default is 8 representing approximately 52ms.

Time

Byte

Debounce increment (debounce time = Time * 6.554ms).

6.6 Set Auto

Repeat Mode

Dec

Hex

ASCII

254 126

FE 7E

■ DEL

Mode

v5.0

Sets key press repeat mode to typematic or hold. In typematic mode if a key press is held, the key value is

transmitted immediately, then 5 times a second after a 1 second delay. In hold mode, the key down value is

transmitted once when pressed, and then the key up value is sent when the key is released. Default is typematic.

Mode

Byte

1 for hold mode or 0 for typematic.

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 36 37

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Matrix-orbital LK162B-7T Manual de usuario Pagina 24

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