Sharp PN-U423 Car Video System User Manual


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31
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,MWIN,MWIP,
EMHV,EPHV,ESHV,ENLG,BOMD
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23).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.
[Example]
ID number: 1 ID number: 2 ID number: 3ID 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.
[E
xamp
l
e
]
ID number: 3 ID number: 2 ID number: 4ID number: 1
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