The other method described above works too...
Set the units address if/when it's the only unit plugged into the chain, or maybe one of those I/O pin goes to a 'program ID' button.
Reprogramming as in - programming each unit with it's own recognition code of some sort.
And while I'm on that, you could use the 3 I/O's for 8 (or 27) different 'addresses', then -reprogram- each 8 (or 27) bunches of units to respond to different addresses...





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