Sharp Computer Monitor Sharp PN-L802B LCD Monitor User Manual

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33
E
Controlling the Monitor with a PC (RS-232C)
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.
* IfanIDnumberhasbeenassigned
O K SPC 0 0 1
ID number of respondin
g
monitor
Space (20
H)
Return code
(0DH, 0AH)
When a command has not been executed
R R E
Return code
(0DH, 0AH)
* IfanIDnumberhasbeenassigned
R R E SPC 0 0 1
ID n
u
m
be
r
Space (20H)
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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.
If execution of the command is taking some time
I W T A
Return code
(0DH, 0AH)
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,PXSL,POWR,AGIN,MWIN,
MWIP,MWPP
When control via RS-232C is locked (to prevent use)
using the operation lock function (see page 31)
E C D K O L
Return code
(0D
H, 0AH)
When RS-232C/LAN SELECT is set to LAN
U N S E L E C T E D
Return code
(0D
H, 0AH)
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.
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.
VOLM0020
OK
INPS0001
WAIT
OK
Interval of 100 ms or more
TIPS
• 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.
Advanced operation
This section explains commands for daisy chain connection.
The basic communication procedure is the same as in the
“One-to-oneconnectionwithaPC”section.
n
ID numbers
YoucanassignauniqueIDnumbertoeachmonitor(see
page 26). 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.
[E
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]
ID number: 1 ID number: 2 ID number: 3 ID number: 4
If monitors are connected as shown above, you can
execute commands like “Set the volume of the monitor with
ID4to20”.
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.
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ID number: 3 ID number: 2 ID number: 4 ID number: 1

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