Sharp PN-Y325 Service Manual ▷ View online
PN-Y325/Y425/Y475/Y555 INSTALLATION, ADJUSTMENT, SETTING 2 - 5
■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 32), you can
make input mode selection/adjustment or can check the status of a specific monitor.
<MEMO>
• To control the monitor via RS-232C, set STANDBY MODE to STANDARD.
• You cannot use RS-232C and LAN control simultaneously.
[PC connection]
■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.
■Daisy chain connection… Advanced operation
PN-Y325/PN-Y425/PN-Y475/PN-Y555 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.)
PN-Y325/Y425/Y475/Y555 INSTALLATION, ADJUSTMENT, SETTING 2 - 6
[Communication conditions]
Set the RS-232C communication settings on the PC to match the monitor’s communication settings as follows:
[Communication procedure]
■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.
Daisy chain connection… Advanced operation
Do not use spaces for DATE. Specify parameters using a specified number of characters.
If a command has “R” listed for “DIRECTION” in the “RS-232C command table” on page 35, the current value can be returned by using “?”
as the parameter.
PN-Y325/Y425/Y475/Y555 INSTALLATION, ADJUSTMENT, SETTING 2 - 7
■Response code format
<MEMO>
“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.
• If no monitor has been assigned the designated ID number (e.g. if the command IDSL0002
is used, but no monitor with ID number: 2
is found), no response is returned.
When the following commands are used, “WAIT” is returned.
In this case, a value will be returned if you wait a while. Do not send any command during this period.
No ID number is attached to WAIT response.
• Commands which return WAIT:
1. When repeater control is used
2. When an IDSL or IDLK command is used
3. When one of the following commands is used: RSET, INPS, ASNC, WIDE, POWR, EMHV, EPHV, ESHV, ENLG
PN-Y325/Y425/Y475/Y555 INSTALLATION, ADJUSTMENT, SETTING 2 - 8
■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.
When connecting multiple monitors in a daisy chain, set the timeout to at least the product of the monitor’s position from the computer
multiplied by 10 seconds.
Example) 3rd monitor from computer: 30 seconds or longer.
• Provide an interval of 100 ms or more between the command response and the transmission of the next command.
<MEMO>
• When executing ALL RESET, set the timeout period to 30 seconds or longer.
• When turning the power on while the POWER ON DELAY function is in use, set the timeout period to the POWER ON DELAY period + 10
seconds or longer.
■ID SETTING
You can assign a unique ID number to each monitor (see page 27). This allows you to control a particular monitor in a daisy
chain of monitors.
You can assign ID numbers either from the menu screen or from the PC using RS-232 cable.
When designating ID numbers for a set of monitors linked in a daisy chain, you should basically avoid any duplication of ID
numbers.
ID numbers do not have to be assigned in ascending order starting from the PC. They can also be connected as shown
below.
Click on the first or last page to see other PN-Y325 service manuals if exist.