# LAN

## Host to Display Data Transfer

- Command Data area stores the data to be transmitted from the host device to the Display.

- After the Display analyzes the Command Data, Response Data area stores the result of "ACK" or "NAK", or no response.

## Display to Host Data Transfer

### Interrupt Output

- In the case of TCP, interrupt output is implemented as follows.

- In the case of UDP, interrupt output cannot be implemented. "Interrupt Output Requests" command is used.
  Interrupt Output Requests

## Details on Frame Format

The memory link LAN frame is structured as follows:

The initial 8 bytes, from frame marker to data length, are provided in all memory link LAN frames. Therefore, during a frame check, the system checks the initial 8 bytes first, and then checks the subsequent data based on the data length specified in the initial 8 bytes.

### Frame Marker (1 byte)

The frame marker is used to identify the frame type.

'B': Binary command frame

'b': Binary response frame

Only binary frames are supported.

### Transaction Control (1 byte)

Transaction control is "0" in the response from Display. Transaction marker is not added.

### Destination Control (1 byte)

Destination control is "0" in the response from Display. Destination block is not added.

### Destination Control Applications

To perform normal 1:1 communication, enter "00h" in the destination control bit.

For "1:n" (multi-link) communication, enter "05h" to request a response from only one target node among an unspecified number of nodes ("n" nodes). To request a response from all the nodes, enter "09h".

### Transaction Marker

Application of transaction marker

After receiving a command frame that includes a transaction marker, the Display executes the command (and sends back a response, if necessary). This process is the same as that for a command frame without a transaction marker. Next, the processing result is stored in the Display.

When the Display receives the next transaction result request, the Display responds by sending the stored data.

The Display can store up to ten transaction results. If there are ten or more transactions, the existing transactions will be deleted, starting from the oldest one, and the new data will be registered.

### Destination Block

A destination block is added when the "Add/Not Add Destination Block" control bit is "1". A destination block is not added when this control bit is "0".