Charles, is there any way to see that SSerial is actually running? Typically 
when you start LinuxCNC from terminal Hm2 will print the sserial version 
running first. I can’t see this by starting a config with Machinekit. I tried 
launching a basic source file and manually loadrt from halrun but the 
differences are such that I couldn’t figure out how to loadrt hm2_soc_ol with 
any config options.  I’m not sure if the “atlas_....sv” file needs a 
modification. For smart serial, like I said I’m just using the same renamed 
3x24.sv I’ve been using.

By “not work” i mean when starting MK plugged into the 8i20 from my mill I get 
no hm2_5i25.0.8i20...... pins as I would  with the 8i20 plugged into the 
7i76e/x86 pc installed on the mill. I didn’t have any issues with the cable, 
connection I made for that and this is pretty much exactly the same.

I’ve checked all my connections but I certainly wouldn’t rule out that I missed 
something. It’d be great if I could find some evidence that either sserial is 
actually running or that the hardware isn’t communicating anything at all, like 
some sort of serial terminal where I could at least check for some sort of 
handshake process.

-- 
website: http://www.machinekit.io blog: http://blog.machinekit.io github: 
https://github.com/machinekit
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