Pin out direction.

Hello all,

I was unsure where to post this but i have another question I'd like to ask.

I have a laser etcher and have it hooked so I turn it on and off via a relay and at this stage a custom M code (M107/M108 for main laser power on/off, M105/M106 for laser burn/not), my issue is that when I turn everything on the relay is powered "ON" due to my BOB, but when i start LinuxCNC it flips the relay off.

Just wondering if there is a way to control this so it does not change state until told so via g-code. I have tried using a startup gcode but this did nothing as i think it is to early before it has assigned everything else, and I tried using the invert signal in the *.hal file but this seams to reset it every cycle time, i just want a "one shot" on startup if that is possible.

Hopefully this is not to difficult and that i have missed something simple, but i will keep looking unless anyone has any ideas to offer.

Thanks for reading and answering if anyone does either of those.

Will

Thanks Tommylight,

Forgot to say I'm running a PCI card as well if that makes a difference.

Dam that sounds annoying as i have used all my other output pins at this point, I'll keep trying to think of a way to get round this if I can.

Might just be easier to have a manual on/off switch somewhere and have the g-code pause with a message window saying turn on maser laser power or something, I mean I need to remove the previous tool before running the laser anyway.

Anyway I will keep thinking and see what if anything I can come up with in time.

Cheers

Will

Can you set up your BOB to use a charge pump, so that everything will be held in a known state until Linuxcnc is in control?