NEC LCD8205 User Manual download pdf (Page 5)

5. Basic Commands

5.1. Communication Format (for Basic Commands)

The command packet consists of four parts, Header, Message, Check code and

Delimiter.

Sequence of a typical procedure to control a monitor is as follows,

[A controller and a monitor, two-way communication composition figure]

5.1.1. Header block format (fixed length)

byte) SOH: Start of Header

ASCII SOH (01h)

byte) Reserved: Reserved for future extensions.

On this monitor, it must be ASCII '0'(30h).

byte) Destination: Destination equipment ID. (Receiver)

Specify a commands receiver’s address.

This value must match the “Monitor ID No.” set in the OSD.

H e a d e r M e s s a g e C h e c k C o d e D e l i m i t e r

Header

Message

Check code

Delimiter

SOH Reserved '0'

Destination

Source Message Type

Message Length

-7

Monitor Controller

Header

Message

Check Code Delimiter

Header

Message

Check Code

Delimiter

Get Parameter

Get Parameter Reply

Header

Message

Check Code Delimiter

Set Parameter

Header

Message

Check Code

Delimiter

Set Parameter

Header

Message

Check Code Delimiter

Header

Message

Check Code

Delimiter

Get Parameter Reply

Get Parameter

The controller sends command to

get a value from the monitor that

you want to change.

The monitor replies a current

value of the requested item.

The controller sends commands to

set an adjusted value.

The monitor replies to the

controller for confirmation.

The controller sends command to

get a value for confirmation.

The monitor replies an adjusted

value.

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NEC LCD8205 User Manual Page 5

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