Matrix-orbital LK404-25 Manual de usuario descargar pdf (Pagina 24)

5.2 Dallas One-Wire

Transaction

Dec

Hex

ASCII

254 200 1

FE C8 01

■ ╚ STX

Flags Send Bits Receive Bits Data

v5.0

Performs a single Dallas 1-Wire transaction. Consult your device documentation for information regarding device

specific protocols. If an error is encountered, a corresponding value will be returned by the device.

Flags

Byte

Flags for transaction, see below.

Send Bits

Byte

Number of bytes to be sent to the device.

Receive Bits

Byte

Number of bytes expected to be received from the device.

Data

Byte(s)

Data to be transmitted LSB to MSB.

Table 14: Dallas One-Wire Flags

Bit

Flag Description

Unused

0 (Future Compatibility)

Add CRC8 to transaction

0 (Future Compatibility)

Read CRC8 from transaction

Reset Bus prior to transaction

Table 15: Dallas One-Wire Errors

Code

Error Description

Success

Unknown Command

No Devices Found

Fatal Search Error

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).

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

Comentarios a estos manuales

Sin comentarios

Matrix-orbital LK404-25 Manual de usuario Pagina 24

Comentarios a estos manuales

Relacionado con productos y manuales para Hardware Matrix-orbital LK404-25