On 29 May 2012 06:00, Jeshua Lacock <jes...@3dtopo.com> wrote:

> Is it possible to make those changes to LinuxCNC? In other words, can 
> LinuxCNC currently command a serial port using those additional M words?

M100-M199 can easily call a shell script, and a shell script can write
to a serial port.
http://superuser.com/questions/301753/how-do-i-print-directly-to-lpt-port-in-ubuntu

Why not control the temperature with a PWM direct from LinuxCNC?

Alternatively, you  could use an Arduino:
http://axis.unpy.net/01198594294

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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