Sharp PN-HS501 - Controlling the Monitor with a Computer (RS-232 C); Computer Connection; Communication Conditions; Communication Procedure

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Controlling the Monitor with a computer (RS-232C)
You can control this monitor from a computer via RS-232C
(COM port) on the computer.
TIPS
• To control the monitor via RS-232C, set RS-232C/LAN
SELECT to RS-232C. (See page 24.)
• You cannot use RS-232C and LAN control simultaneously.
Computer connection
Connect with RS-232 straight cable between the computer’s
COM port (RS-232C connector) and the RS-232C input
terminal on the monitor.
RS-232 straight cable
(commercially available)
To COM port
Computer
RS-232C
input terminal
Communication conditions
Set the RS-232C communication settings on the computer 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 computer to the monitor,
the monitor operates according to the received command and
sends a response message to the computer.
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: 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 ? ? ? ? ←
From computer to monitor (How
much is current volume setting?).
30 ←
From monitor to computer
(Current volume setting: 30).
n
Response code format
When a command has been executed correctly
O K
Return code
(0DH, 0AH)
A response is returned after a command is executed.
When a command has not been executed
R R E
Return code
(0DH, 0AH)
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.
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.