User's Manual

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)
1
st
byte) SOH: Start of Header
ASCII SOH (01h)
2
nd
byte) Reserved: Reserved for future extensions.
On this monitor, it must be ASCII '0'(30h).
3
rd
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
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
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.