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Every reference I've looked at for Arinc429 specification has something like this:

enter image description here

Okay, pretty simple. There is only one transmitter and up to 20 receivers.

However, the name of the SDI (source/destination identifier) field is confusing me.

It implies that there can be multiple transmitters by allowing you to define "where" the message has come from being sent to a receiver.

Is that simply useful for debugging purposes? It might make sense if there some sort of data recorder listening to all the arinc buses.

MFerguson
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1 Answers1

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The image from ARINC-429 TUTORIAL & REFERENCE indicates that the SDI field is used to indicate which reciever is to process the message.

EDIT: A source does not necessarily mean a transmitter.

Several hardware or software sources can/may share the same transmitter. Each destination may procss messages from one or more of these sources as indicated in the field.

enter image description here

RussellH
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  • You said "each destination may process messages from one or more sources". What other sources? There's only one, the transmitter, which was the whole point of the question. – Simon Fitch Jun 28 '23 at 03:44
  • In general there is no reason that several sources cannot share the same transmitter. The tutorial may indicate whether the Arinc-429 does this or not. I haven't done through the tutorial or the specification. If there must be one transmitter per source, then the field can only be used to indicate destination.@SimonFitch – RussellH Jun 28 '23 at 03:59
  • Furthermore a single reciever could also service several destinations. @SimonFitch – RussellH Jun 28 '23 at 04:03