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Communication Format; Header Block Format (Fixed Length) - NEC V321-2 Communications Manual

V321-2 : rs232 codes for v321, v421, v461
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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
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)
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
Save Current Setting Command Reply
Header
Message
Command
Check Code
Message
Command Reply
Header
Message
Destination
Source
rd
th
3
4
Check Code
Delimiter
Monitor
Header
Check Code
Delimiter
Header
Check Code
Delimiter
Header
Check Code
Delimiter
Header
Check Code
Delimiter
Header
Check Code
Delimiter
Header
Message
Message
Message
Type
Length
th
th
5
6
(2/37)
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
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.
The
monitor
replies
controller for confirmation.
The control does not suitable for
above fixed protocol; use the
proper command for each control.
Please refer section 5.5 and
section 7 to 13.
The
monitor
replies
message defined for each control.
Check code
Delimiter
th
-7
to
the
to
the
a
proper

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