Operation Manual

31
E
Controlling the Monitor with a PC (RS-232C)
You can control this monitor from a PC via RS-232C (COM
port) on the PC.
PC connection
Connect with RS-232 straight cable between the PC’s COM
port (RS-232C connector) and the RS-232C input terminal on
the monitor.
RS-232 straight cable
(commercially available)
To COM port
PC
RS-232C
input terminal
Communication conditions
Set the RS-232C communication settings on the PC to match
the monitor’s communication settings as follows:
Baud rate 9600bps Stop bit 1 bit
Data length 8 bits Flow control None
Parity bit None
Communication procedure
n
Command format
When a command is sent from the PC to the monitor, the
monitor operates according to the received command and
sends a response message to the PC.
C1 C2 C3 C4 P1 P2 P3 P4
Return code
Command field
(4 prescribed
alphanumerical characters
)
Parameter field
(4 character string comprised of:
0-9, space, ?)
Example: VOLM030
* Be sure to input 4 characters for the parameter. Pad with
spaces (“
”) if necessary.
(“
” is a return code (0D
H
))
Wrong : VOLM30
Right : VOLM030
The current value can be returned by using “????” as the
parameter.
Example:
VOLM ? ? ? ? ←
From PC to monitor (How much
is current volume setting?).
30 ←
From monitor to PC (Current
volume setting: 30).
n
Response code format
When a command has been executed correctly
O K
Return code
(0DH)
A response is returned after a command is executed.
When a command has not been executed
R R E
Return code
(0D
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 PC 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 retries the
command if this occurs.
n
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.