Controlling The Monitor With A Computer (Rs-232C); Computer Connection; Communication Conditions; Communication Procedure - Sharp PN-B401 Operation Manual

Controlling the Monitor with a computer (RS-232C)

You can control this monitor from a computer via RS-232C
(COM port) on the computer.
You can also connect multiple monitors via a daisy chain by
using a computer. By assigning ID numbers to each monitor
(see page 36), you can make input mode selection/adjustment
or can check the status of a specific monitor.
TIPS
• To control the monitor via RS-232C, set RS-232C/LAN
SELECT to RS-232C.
• You cannot use RS-232C and LAN control simultaneously.

Computer connection

nOne-to-one connection with a computer
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-232C RS-232 straight cable
input terminal (commercially available)
nDaisy chain connection...
Connect with RS-232 straight cable between the computer's
COM port (RS-232C connector) and the RS-232C input
terminal on the first monitor.
Next, connect RS-232 straight cable to the first monitor's
RS-232C output terminal and to the second monitor's
RS-232C input terminal. Connect in the same way to the third
and subsequent monitors.
Up to 4 monitors can be connected. (Depending on the length
of the cable used and the surrounding environment.)
Second monitor
RS-232C
output terminal
First monitor
RS-232C
input
terminal
Computer
To COM port
Advanced operation
RS-232 straight cables
(commercially available)
Computer
To COM port

Communication conditions

Set the RS-232C communication settings on the computer to
match the monitor's communication settings as follows:
Baud rate *
Data length 8 bits
Parity bit None
* Set to the same baud rate as the BAUD RATE setting of
SETUP menu. (Initial setting: 38400 bps)
* When connecting multiple monitors in a daisy chain, set all
monitors to the same BAUD RATE.

Communication procedure

nCommand 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
Command field
(4 prescribed
alphanumerical characters)
Example: VOLM0030
VOLM 30
* Be sure to input 4 characters for the parameter. Pad with
spaces (" ") if necessary.
(" " is a return code (0D
Wrong : VOLM30
Right : VOLM 30
When inputting a negative value, specify a numerical value in
three digits.
Example: OFSR-127
When the parameter part is 5 or more characters, specify
parameters using a specified number of characters without
using spaces.
Example: MPOS010097
If a command has "R" listed for "Direction" in the
"RS-232C command table" on page 39, the current value can
be returned by using "?" as the parameter.
Example:
VOLM ? ? ? ? ←
30 ←
* If an ID number (see page 36) has been assigned
(For example, ID number = 1).
VOLM ? ←
30 001 ←
Stop bit 1 bit
Flow control None
Return code
P1 P2 P3 P4
Parameter field
(4 character string comprised of:
0-9, +, -, space, ?)
, 0A or 0D ))
H H H
From computer to monitor (How
much is current volume setting?).
From monitor to computer
(Current volume setting: 30).
From computer to monitor.
From monitor to computer.
35
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