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4. Communication Format
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]
4.1 Header block format (fixed length)
1
st
byte) SOH: Start of Header
ASCII SOH (01h)
2
nd
byte) Reserved: Reserved for future extensions.
LCD3215/LCD4215 must be ASCII '0'(30h)
3
rd
byte) Destination: Destination equipment ID. (Receiver)
Specify a commands receiver
’
s address.
LCD3215/LCD4215 must be ASCII 'A' (41h).
Header
Message
Check Code
Delimiter
Header
Message
Check code
Delimiter
SOH
Reserved
'0'
Destinatio
'A'
Source
Message
Type
Message
Length
1
st
2
nd
3
rd
4
th
5
th
6
th
-7
th
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 Reply
Header
Message
Check Code
Delimiter
Header
Message
Check Code
Delimiter
Get Parameter Reply
Save Current Setting Command
Get Parameter
Header
Message
Check Code
Delimiter
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.
The controller requests to store
the adjusted value to the monitor.
