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© 2007 Yamar Electronics Ltd.

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DS-ISL40 R1.6

Read-state:

Detecting Read-state header causes the ISL40 to send its input pins current state.

The Read-state message from the master consists of 3 bytes - sync break, sync field and identifier. The

identifier of this message begins with the four-bit ID of the device, 00, followed by the 2 protection bits.

The ISL40 responds with a data byte containing its eight input Signal pins followed by the checksum

byte. The checksum is the sum of the protected identifier and of the data byte as in LIN2.0.

Figure 3.2 shows a generic read state message.

Figure 3.2 Read State message

Read-change:

This header from the master causes the ISL40 to send information on changes of its input pins since

the last Read message. The first change on the pin after the Read message switches its sent value.

This command enables a detection of a pulse like change that accord between two consecutive Read

commands.

Figure 3.3 shows the process of determining the sent value of an input pin.

Figure 3.3 - Determining the recent changed value of an input pin

The Read-change message from the master has 3 bytes - sync break, sync field and identifier.

The identifier begins with the destination device four-bit ID, followed by 01 and terminating with 2

protection bits. The response for this Read-changes message is a data byte containing the ISL40`s

input pins recent changed value, followed by the checksum byte. The checksum is according to LIN2.0

specifications. Figure 3.4 shows a Read-changes message.

Figure 3.4 Read-changes message

Sleep message:

This type of message consist of 5 bytes - sync break, sync field, “3C” Hex, “00” Hex and checksum.

The sleep message identifier is “3C”Hex as in LIN2.0 specifications and the following data byte

“00”Hex.

Upon reception of sync break, sync field, “3C”Hex and “00”Hex bytes, the device enters sleep mode

immediately, therefore, as a result its following bytes and checksum are ignored.

Sync break

Sync Field

P1, P0, 0, 0, Address

Data (8 input bits)

Checksum

Master

Slave

Master

Slave

Sync break

Sync Field

P1, P0, 1, 0, Address

Data (8 input bits)

Checksum

Read message

1 bit

Input pin level

Sent value