Sharp LC-M3700, Operation Manual

Page: 39 / 73

US
38
Communication procedure
Basic operation
<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
Command field
(4 prescribed
alphanumerical
characters)
Parameter field
(4 character string
comprised of:
0-9, +, –, space, ?)
Carriage return code
C2 C3 C4 P1 P2 P3 P4
↵
O
Carriage return code
(0D
H
, 0A
H
)
K
↵
Example: VOLM0030
POWR 1 (“ ” indicates a space.)
* Be sure to input 4 characters for the parameter. Pad with spaces if necessary.
×
VOLM30
䡩
VOLM 30( ) (“ ” indicates a space, “ ” is the carriage return code
(0D
H
, 0A
H
or 0D
H
).)
If a command has “R” listed for “Direction” in the “RS-232C Command table” on page 46 , the cur-
rent value can be returned by using “?” as the parameter.
Example:
1
If an ID number has not been set:
VOLM????
←
From PC to monitor (current volume setting: ?)
30
←
From monitor to PC (current volume setting: 30)
2
If an ID number has been assigned (For example, ID number = 001)
VOLM ?
←
PC to monitor (“ ” indicates a space)
30 001
←
Monitor to PC (“ ” indicates a space)
<Response code format>
■
When a command has been executed correctly
This is returned when execution of the command is
finished.
■
When a command has not
been executed correctly*
E
Carriage return code
(0D
H
, 0A
H
)
R R
↵
* This is returned when there is no such command,
or when the command cannot be used in the
current state of the monitor (i.e. video auto-adjust-
ment with video display).
* If there is a bad connection between the PC and
monitor, or if communication has not been estab-
lished, nothing is returned (not even ERR).
■
If execution of the command is
taking some time
W
Carriage return
code (0D
H
, 0A
H
)
A I T
↵
If a command takes some time to execute, WAIT may
be returned as the return value. Wait for a moment, and
OK or ERR will be returned. New commands cannot be
received during this time, even if they are sent.
PC Operation (Continued)
■
If RS-232C is locked
If RS-232C control has been locked with Control lock
(see page
54 ), LOCKED is returned as the returned
value. L
Carriage return code
(0D
H
, 0A
H
)
K E D O C
↵