I am implementing laser cutting with ink-jet part marking solution. Ink-jet
printer/head is attached near the laser head. It accepts one text string to be
printed via some serial data channel, then waits for start signal on a
dedicated wire. I get acknowledgments for text received and text printed from
the printer.
I decided to use ;py,mark_text("ABC 123") syntax in G-code. All python code is
in toplevel.py or imported from there..
It works, but I don't know how to raise an error for the program to stop and give message
to operator, like "Some printer communication time-out..".
If I use:
from emccanon import CANON_ERROR
CANON_ERROR("Do you see the printer? I can't find it!")
Then UI shows the error message, but program is not stopped.
Then if I write:
import linuxcnc
from emccanon import CANON_ERROR
c = linuxcnc.command()
CANON_ERROR("I'm lost, please help me!")
c.abort()
Program aborts, but no message appears.
I thought I could use:
from hal import set_p
from emccanon import CANON_ERROR
CANON_ERROR('Here, I found a pencil for ya! Might be broken, sorry..')
set_p("halui.program.stop", '1')
It is the same to my surprise - still no message.
-
Other questions related to this solution:
2. No way to pass string parameter from NGC? I found ;py,whatever('is the only
solution').
3. How to make ;py blocking()? I use M6 Tn before ;py nonblocking() to make it
work on time.
4. Idea: even HAL pins could accept strings...
5. How to program serial communication with receiver call-back or thread
working in background, waiting for print confirmation, which would allow to
send next string and continue motion without stopping for communication with
printer.
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