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Hi everyone.
I am setting up a Plasma Cutter with QtPlasmaC v2.9 in mode 2 with one parallel port and step motors and a Hypertherm PowerMax 105.
The configuration is working fine but I am having a hard time with the ARC OK signal as the message of "valid arc lost" keep showing up.
It looks like it does not wait the time set on parameter "Start Fail Timer" after turning the torch on to turn on the message. It also does not try to turn on the torch again after the time set on parameter "Retry Delay" not even once (even with the parameter "Max Starts" set to 3.
As outputs I just configure the axis motors and Plasma Torch ON.
As inputs I have ESTOP IN, Plasma Float Switch, Plasma Move Up, Plasma Move Down and Plasma Arc OK.
It does have to be able to wait for the Arc OK signal and try to restart the plasma if the signal does not show up

Any information will be helpfull to find out where I have a problem with my configuration.

Thank you all.
 

try the following:
[KINS]
JOINTS = 4
KINEMATICS = trivkins coordinates=XYYZ

[TRAJ]
COORDINATES = XYYZ

HOME_SEQUENCE = 2 (x)
HOME_SEQUENCE = -3 (y)
HOME_SEQUENCE = -3 (y2)
HOME_SEQUENCE = 1 (Z)

PCW wrote:

Here's a 4 --> 2 diode encoder with polarity adjusted
for 7I73 inputs that have built-in pullup resistors
(so read high if unconnected)

Note that mux_generic has built in debouncing so the capacitors should not be needed if you use mux_generic to select jog increments etc.
 

Again, thank you so much for including this schematic! It helped to explain quite a lot, but after poking around on Google I could not find an existing product that does this. It seems weird that such a thing wouldn't exist, so maybe this will be my first electronics CAD project, to create a PCB!

If anyone reading this knows where these products already exist, please comment below!

As an aside, I have never had to test diodes before, so this was a learning experience in other ways. Without putting together a breadboard and trying it out, I wouldn't have had a reason to look into it.

I created this graphic to illustrate the function of a Mux8 switch (as I understand it today, which could be wrong), using a 12-position 1-pole switch and twelve diodes to output three bits. I decided to ignore 9-12, since it would require another bit.

After corrections: