Reply To: 1983 Master Control Link System wiring guide

[TK]

Thanks for the document, @pl212.  You’ve probably seen the MCL’82 protocol document (attached) that I uploaded a few months back.  It represents the final variant of MCL1 before the release of MCL2 (Datalink ’86).  There was almost no documentation that I could find when I assembled this protocol document, which was created mostly by me spying on the messages being passed between a Beomaster 5000 and MCP 5000.  There are still a few straggler messages whose meaning I have yet to fully decipher, which I hope to get to some day.

I recently acquired an original MCP, designed for use with the Beocenter 7700 (which I don’t yet have).  Just based on the jumpers I see in the 2041 relay boxes, I’m thinking the MCP instruction set is unique to the 7700 – or at least the response messages will be – but I’d venture to guess there will be some overlap in the command set between the MCP and MCP 5000.  Having just the MCP, I’ll be able to verify outbound commands for starters.  If you happen to have a Beocenter 7700, perhaps you can add to the knowledge-base by providing the responses for the documentation.

I’m in Marin, so we’re close by each other, and can get together to compare notes over lunch, if you’re interested.

 

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