Matrix-orbital LK202-24-USB Manual do Utilizador descarregar pdf (Página 30)

6.4.1 Transaction command (254 C8 1 [ﬂags] [Send Bits] [Recieve bits]

[Send data])

The transaction command will perform a single transaction on the 1-wire bus in this order;

1. Bus Reset.

2. Transmit data onto the bus.

3. Receive data from the bus.

Table 15: 1-Wire Transaction

Offset

(Bytes)

Length

(Bytes)

Name Description

0 1 Flags The ﬂags byte controls the optional

components of the transaction.

1 1 Send Bits The number of bits that will be

transmitted onto the bus. The actual

bits to be transmitted are held in the

Send Data section.

2 1 Recieve Bits The number of bits to read off the

bus after the data to be put on the

bus has been sent.

3 Variable Send Data The data to be transmitted onto the

bus. The data is transmitted MSB

to LSB in the order that they are re-

ceived.

Table 16: 1-Wire Flags

Bit Description

6 Unused

5 (0 for future compatibility)

3 Add a CRC8 to the end of the transmitted data

2 (0 for future compatibility)

1 Assume last received byte is a CRC8 and validate it

0 Reset bus before transaction

The received data is sent back using the “Display return protocol”.

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Matrix-orbital LK202-24-USB Manual do Utilizador Página 30