Cyrus 8 DAC - MC-BUS OPERATION; MC-BUS system test

MC‐BUSOPERATION
©CyrusAudioLtdJun2014 19 Cyrus6DAC,Cyrus8DACservicemanualIssue1
MC‐BUS
MC‐BUSisasystemwhichprovidescommunicationbetweenthecontrolsystemsofanumber 
of Cyrus products. The communication takes the form of a serial data stream which is sent
froma'master'productandreceivedandrepeatedby'slave'products.Thedataisthuspassed
from one product to another around a loop. The master product should then receive the
message back which confirms that loop connections have been correctly made. Cyrus
amplifiers are 'master' products and send commands following certain key sequences.
Products such as CDplayersand tuners are'slaves'and onlylisten to MC‐BUSforcommands
whichmaybeappropriate.
MC‐BUSsystemtest
The MC‐BUS system can be tested by substituting the amplifier into a known working Cyrus
systemwithaCDplayerortuner.NotethatMC‐BUSmustbeconnectedasaclosedloop.Itis
also important to connect the audio signal cables between components to provide an
adequate
groundreturnpath  fortheMC‐BUSsignals.Switchon thepowertothesystemand
setall components to Standby.Selectinganinputonthe amplifier will now activateboththe
amplifier and the selected device (tuner or CD as connected). When the amplifier is set to
Standby,allother
componentsconnectedtotheMC‐BUSloopwillalsosettoStandby.
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MC‐BUSout
MC‐BUSout
MC‐BUSin
MC‐BUSin
Amplif ier
Tuner,CDpla yeretc .
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