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APPENDIXD:M‐BUS

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 Measuringcentres

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MC320,MC330,MC350&MC350H‐User’sManua

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APPENDIXD:M‐BUS

TheM‐BUSinterfacefullycomplieswithM‐BUSEuropeanstandardEN13757‐2. Theentirecommunicationis

ensuredwith8DataBits,EvenParity,1StopBitandaBaudRatefrom300to9600Bauds.

Communicationsettings

The M‐Bus communication settings could be done via LCD screen. In Main menu select Settings and then

Communication.TheLCDscreenwillshowthefollowingpicture:

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MainmenuSettingsCommunication

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 M‐BUSaddressrepresentsprimaryaddressthatisdefaultsetto0.Theprimaryaddresscouldtakes

numbersfrom0to250.Higheraddressisusedforspecialpropose.

 M‐BUS S.address represents secondary address that is default set to serial number of device. The

secondaryaddresscouldbeany8digitsnumber.

 BitspersecondsrepresentBaudrateofcommunicationandcouldbeinrangefrom300Bdto9600Bd

Commandtelegrams

InitializeM‐Bus(SNK_NKE)

ThisShortTelegraminitializestheM‐BUSMC350.TheM‐BUSMC350confirmscorrectreceiptbySingleCharacter

Acknowledgement(ACK=E5).Ifthetelegramwasnotcorrectlyreceived the MC350 will not send an

acknowledgement.

SelectM‐BUSMC350UsingSecondaryAddress(SND_UD)

ThisTelegramenablestoselectM‐BUSMC350.TheM‐BUSMC350confirmsthecorrectreceiptbyACK.Ifthe

telegramhasnotbeencorrectlyreceivedtheM‐BUSMC350willnotsendanAcknowledgement.Afterissueof

theSingleCharacterAcknowledgementtheM‐BUSMC350isreadytotransmittheentireRead‐outDatawithin

3secondsfromreceivingtheTelegram„TransmitRead‐outData“.Attheendof3secondstheM‐BUSMC350

willswitchbacktonormalmode.

TransmitRead‐outDataviaPrimary/SecondaryAddress(REQ_UD2)

ThisShort Telegramenables to select the M‐BUS MC350 and tocommandittotransmittheRead‐outData

parameterized.TheM‐BUSMC350confirmscorrectreceiptbytransmittingoftheRead‐outData.IftheShort

Telegramhasnotbeenreceivedcorrectly;noDatawillbetransmittedbytheM‐BUSMC350.TheRead‐outData

aresentwithin35–75msfromreceiptoftheShortTelegrambytheM‐BUSMeter.AppendixDshowsM‐Bus

telegrams.

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Iskra MC330 User Manual

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