MDI100-199 Commands

I did wrote some MDIxxx Shell Script commands and was surprised, that it gives me all the time the two Parameter P and Q over als a float even if there isn't a command given. Worse is that it gets the value of -1.0 if there isn't a Parameter named in the GCode. Because I do not see how to differ between a value of -1.0 and a not even given value.

Example:with GCode:
M100 P0 Q0 give me the output of "2 0.0 0.0"
M100 P0 give me the output of "2 0.0 -1.0"
M100 give me the output of "2 -1.0 -1.0"

Where I wanted to build a function that is working in a main usage way if no P and Q ist given and a special when it is given.

I don't know if I do something wrong because I am new to this and have much more questions.

hi
welcome you can use if then or eQ
LT GT
see the gcode to get things done your way
www.linuxcnc.org/docs/html/gcode.html

I now to write a bash script but I don't know how I get it that there is no Q or Q-1.0 or how if there is no P or P-1.0 because my script did not well because it was getting a value of -1.0 for $1 or -1.0 für $2 when in the GCode was not any input for P or Q

But I do need the value -1.0 as well and it should be a different thing than if ther isn't a value. I do want to diff the two cases: GCode M100 and M100 P-1.0 and this is actual not possible as I get always in both cases the command M100 -1.0 -1.0 what makes it impossible to decide that there isn't a P given or not.

on all systems
the -1 is NO VALUE if you inizialazise a parameter without value given

the call is like linuxcnc.org/docs/html/gcode/o-code.html#cha:o-codes shown here

Question what are you trying to adchive there might be some ready made to help you

ok that is a help for user. How to create such kind of functions as a predefined work around.

As for a user it should be one call like o100

that he doesn't need to write it self in each GCode that he creates for this machine.

there should not be a initialisation if there is no data passed through as a shell Script doesn't need unused data forwarded.

Else there is never some differ between

M100
amd
M100 P...

as I thought, that it is M100 [Pn] [Qn] and that it is possible to differ between

M100

and

M100 P-1.0

else the M100 should be force to use P and Q if it allway us it.

For example I wrote a command to give presure in Pos 1 and 2 or both.

the common way should be both so it is easy to write

M100
ready

in that function I could get the problem sorted because the value -1.0 isn't really possible

M100 P1 does it in Position 1 and

M100 P2 does it in Position 2

but what if the value that I pas is a position that can be between -1000.00 and 1002.00

Than I must pass allways the second parameter because it will not be possible to decide if their was a parameter or not.

even to use always floate is boring but I get in scripts the .0 with ${1%.*} away.

as you aready need a main ngc to get your stuff cordinated
you can do
#5 = 105
o <[#5+6]> call

so you can decide on the main decision ngc on if then or all logic or,and what you want to call
like if we got a parameter then call m100 Parameter1
else if parameter eq 2
call M100 P1 p2
else call M100

there are many easy ways to decide

I am new to this and do not really understand where i do need that ngc and how does it work and I did not use python because I do not really know it as well. I am able to use C and a bit C++ but this are old abilities - not trained ones.

I do understand to write a bash or dash script and it was working with a script so I did the script. Until now I could manage it without the real need of knowing if there is a parameter because it was only for things where the -1.0 isn't possible as a parameter but I know this will change soon.

So I would like to understand how the #5 = 105 is to understand as I understand that o will call a subroutine. But I am not sure.

I am glad to watch the machine working and I got all dependencies included.