With how cheap realtime i/o is - I don't see the a lure of modbus.
Modbus non-realtime should be plenty fast enough for spindle control
unless you are doing position control of the spindle. I'm not sure about
RTAI but if you are using preempt-rt mb2hal should be pretty close to
real time.
It's also great for user interface stuff. For instance both my mill and
lathe have Modbus front panels with 20+ buttons, numerous indicator
lights as well as a number of analog controls.
For jog wheel I have to agree, a direct realtime input is the way to go.
Modbus jog wheel should work but it won't be as smooth.
It's a bit unusual in that mb2hal consumes an INI file, but it is not
the same INI file as defines the LinuxCNC machine config.
You can specify the machine config ini file if you wish. The mb2hal ini
file namespace does not conflict with anything else in the machine config.
Les
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