I also suggest testing the cables.
I had lots of issues with twinax. Pins getting pushed in, etc.
Some terminals only look like you can hook twinax directly into them. Instead you had to go to a T or Y connector which then hooked into the terminal. And sometimes, even then, you might have to put a terminator cap on the unused end. Some T or Y connectors are auto terminating.
Also, did you set the address to 0 on the device?
I hate twinax. Been rid of it for decades.
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