Data Sheet

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29
ETHERIO24TCPDATASHEET
AutoScanConfiguration
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TheAutoScanmodewillallowthemoduletooriginatecommunicationwitha
remotedeviceoranotherEtherIO24module.Thismodeisveryusefulas
itallowsyoursoftwarethefreedomtonothavetopollthemoduleto
checkthestateoftheinputs.
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AnoverviewoftheAutoScansettingscanbefoundintheAutoScansection
oftheWebInterfaceChapterabove.
BasicFunctionality
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OnceAutoScanisconfigured,anyinputstatechangesontheconfigured
portwillautomaticallybesenttoahostoranotherEtherIO24module.
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TheAutoScanresponseformatisshownbelow:
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AutoScan
Response
Bytes Data
*PortValue 3
Port isthemodulePortinwhichthestatehad
changed
Valueisthenewvalueoftheport
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TheAutoScanpacketisprefixedwitha‘*’toenableittobe
differentiatedfromanormalreadportreturn.Forexample,ifPortAis
configuredforAutoScan,anyinputpinchangeswillbesentintheform:
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*A[New port value]
Tipsandtricks
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• AutoscanwillonlyworkwithvaluesthataresettoInputs
• Don’tleavefloatinginputpinswhenusingautoscanasthepins
willchangestateandconstantlysenddata.Tiethemtoaknowstate
byusingthein‐builtPull‐ups,orsetthemasoutputsifnotbeing
used.
• TheAutoscanpacketsentbackfromtheEtherI/Ocontains3bytes
‘*’‘PortDesignator’‘HexPortValue’e.g.*A0datainpacketUDP
packetwillbe2a4100
• Besuretosetthescanperiodandscancountappropriatelyforyour
application
• UseaprogramcalledEtherealorWireSharktodebugthepackets
beingsentbackandforthfromthePCtotheEtherI/O24andvice
versa.(www.ethereal.comwww.wireshark.org)
• Knowwhatdataisbeingsentbackwiththevariouscommandssent.
E.g.SendingIO24willreturn12bytes,Readcommand2bytes,etc
©
2013ElexolPtyLtd Revision1.3
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