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Controlling the monitor with a pc (rs-232c), Pc connection, Communication conditions – Sharp PN-U423 User Manual

Page 30: Communication procedure, None-to-one connection with a pc, Ndaisy chain connection, Ncommand format

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

You can control this monitor from a PC via RS-232C (COM

port) on the PC.

You can also connect multiple monitors via a daisy chain by

using a PC. By assigning ID numbers to each monitor (see

page 31), 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, and STANDBY MODE to

STANDARD.

• You cannot use RS-232C and LAN control simultaneously.

PC connection

n

One-to-one connection with a PC

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

n

Daisy chain connection…

Advanced operation

PN-U553/PN-U473/PN-U423 monitors can be connected

together in a daisy chain connection.

Connect with RS-232 straight cable between the PC’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 25 monitors can be connected. (Depending on the

length of the cable used and the surrounding environment.)

To COM port

RS-232 straight cables (commercially available)

PC

First monitor

Second monitor

RS-232C

input terminal

RS-232C

output 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: 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

Do not use spaces for MPOS, DATE, and SH01 through

SH07. Specify parameters using a specified number of

characters.

Example: MPOS010097

If a command has “R” listed for “DIRECTION” in the

“RS-232C command table” on page 34, 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).

* If an ID number (see page 31) has been assigned

(For example, ID number = 1).

VOLM

?

From PC to monitor.

30 001

From monitor to PC.

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