Communication Format - NEC MultiSync LCD3210 LCD3210 LCD3210 Owner's Manual

4. Communication Format

Header
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]
Controller
Delimiter
Delimiter
Delimiter
Delimiter
4.1 Header block format (fixed length)
Reserved
SOH
'0'
st nd
1 2
st
1 byte) SOH: Start of Header
ASCII SOH (01h)
nd
2 byte) Reserved: Reserved for future extensions.
LCD3210 must be ASCII '0'(30h)
rd
3 byte) Destination: Destination equipment ID. (Receiver)
Specify a command's receiver's address.
LCD3210 must be ASCII 'A' (41h).
Message
Get Parameter
Check Code
Message
Get Parameter Reply
Header Message
Set Parameter
Check Code
Message
Set Parameter Reply
Header Message
Get Parameter
Check Code
Message
Get Parameter Reply
Header Message
Save Current Setting Command
Check Code
Message
Destination
Source
'A'
rd th
3 4
Check Code Delimiter
Monitor
Header
Check Code
Delimiter
Header
Check Code
Delimiter
Header
Check Code
Delimiter
Header
Header
Message
Message Message
Type Length
th th
5 6 -7
(2/38)
The controller sends a command to
get a value from the monitor that
you want to change.
The monitor replies with the
current value of the requested
item.
The controller sends commands to
set an adjusted value.
The monitor replies
controller for confirmation.
The controller sends a command to
get a value for confirmation.
The monitor replies
adjusted value.
The controller requests to store
the adjusted value to the monitor.
Check code Delimiter
th
to the
with an