NEC 4P-B75EJ2U Operation Manual - Page 53

Communication conditions, Communication procedure

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[ENGLISH] Contents 1. Part Names 2. Introduction 3. Direct Button Operation 4. On-Screen Display Menu 5. Application 6. Using a PC 1. Control of the TV 2. PC Compatibility Chart/AV Compatibility Chart 7. Appendix 8. Specifications 9. Trademarks 10. Dimensional Drawings >> Using a PC

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[ENGLISH]
Contents
1. Part Names
2. Introduction
3. Direct Button Operation
4.
On-Screen Display Menu
5. Application
6. Using a PC
1. Control of the TV
2.
PC Compatibility Chart/AV
Compatibility Chart
7. Appendix
8. Specifications
9. Trademarks
10. Dimensional Drawings
Ver. 1.0.0
>>
<<
Communication conditions
Set the RS-232C communication settings on the computer to match
the monitor’s
communication settings as follows:
Baud rate
9600bps
Data length
8 bits
Parity bit
None
Stop bit
1 bit
Flow control
None
C1
C2
C3
C4
P1
P2
P3
P4
Communication procedure
⚫
Command format
When a command is sent from the computer to the monitor, the monitor operates
according to the received command and sends a response message to the
computer.
Return code
Command field
(4 prescribed
alphanumerical characters)
Parameter field
(4 character string comprised of:
0-9, +, -, space, ?)
Example: VOLM0030
VOLM
30
*
Be sure to input 4 characters for the parameter. Pad with
spaces
(“
”) if
necessary.
(“
”
is a return code (0D
H
, 0A
H
or 0D
H
)) Wrong
: VOLM30
Right
: VOLM
30
The current value can be returned by using
“?”
as the parameter.
Example:
VOLM
?
←
30
←
From computer to monitor (How
much is current volume setting?).
From monitor to computer
(Current volume setting: 30).
⚫
Response code format
When a command has been executed correctly
O
K
Return code
(0D
H
, 0A
H
)
A response is returned after a command is executed.
When a command has not been executed
E
R
R
Return code
(0D
H
, 0A
H
)
TIPS
•
“ERR”
is returned when there is no relevant command or when the command cannot
be used in the current state of the monitor.
•
If communication has not been established for reasons such as a bad connection
between the computer and monitor, nothing is returned (not even ERR).
•
“ERR”
may be returned when a command cannot be received correctly due to
interference from the surrounding environment.
Please ensure that the system or software resends the
command if this occurs.
⚫
Communication interval
•
After OK or ERR is returned, you must send the following commands.
•
To set a timeout for the command response, specify 10 seconds or longer.
•
Provide an interval of 100 ms or more between the command response and the
transmission of the next command.
en-US 52
Control of the TV
Using a PC