Iskra MC330 - APPENDIX D: M-BUS; M-Bus Communication and Commands


APPENDIXD:M‐BUS

6
8
 Measuringcentres
–
MC320,MC330,MC350&MC350H‐User’sManua
l

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:

MainmenuSettingsCommunication


 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.
