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Messages - joeaverage

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851
General Mach Discussion / Re: Manual pulse encoder & mach3
« on: January 28, 2022, 11:25:44 PM »
Hi,
Machs parallel port is actually much more than just a port, its a software driven motion controller. You can only have one motion controller, either an ESS OR a parallel port,
you can't have both.

The ESS has three ports, set up and numbered to match the old-school parallel port which it replaces. If you have motor motion, jogging etc through the ESS then
all three ports should work. Note the in the ESS plugin you can select, at least for ports two and three, to have pins 2-9 (of each port) as inputs OR outputs. How have you set
them up?

Craig

852
Hi,
this post should be in the Mach4 General Discussion board.

What it means is that when that particular piece of code is running the program expected a number, but got a nil....ie the number has never been initialised.
You need to open the Lua script and find the offending bit of code and work out why its doing it. Usually it means that you are not initialising a variable somewhere.

Craig

853
Hi,

Quote
Also found reference to connect DIR+ to 5v rather than DIR- to common? Now I'm really confused!

I have told you several times on the Warp9 forum to try swapping the Dir+ and Dir- wires....have you tried it?

Craig

854
General Mach Discussion / Re: Manual pulse encoder & mach3
« on: January 25, 2022, 10:09:53 PM »
Hi,
500mW would be plenty, but really anything you can get.

Craig

855
General Mach Discussion / Re: Manual pulse encoder & mach3
« on: January 25, 2022, 09:06:18 PM »
Hi,
yes, its that simple.

Craig

856
Hi,
thats why I always try to write code in a script file....so I can test it out BEFORE loading it into the Screen Load script and causing yourself some grief.
Just wait until you have a F'up in the PLC script....that'll have you pulling your hair out! The fault gets triggered each time the script runs, a hundred times a second or so.

Craig

857
General Mach Discussion / Re: Manual pulse encoder & mach3
« on: January 25, 2022, 08:30:41 PM »
Hi,

Quote
Or, is what I am looking at that the Zener draws some of the power from A and B dumping it into the ground?

Yes that is correct, it sort of 'diverts' the extra voltage from getting into the BoB....we don't want to put any stress on the ESD diodes in the ICs.

Quote
And for the drawing, do I just sodler the junctions (little green circles)?

You can if you wish, I would just poke the wire in with the wire from the A output in the same screw terminal. The negative (COM) side hopefully you have a COM screw
terminal within reach and you can poke it into there.

Craig

858
General Mach Discussion / Re: Manual pulse encoder & mach3
« on: January 25, 2022, 08:11:25 PM »
Hi MN300,

Quote
If the output of the encoder has a totem pole with 4.7K in series it won't pull the C10 input down to a reliable level.

You might be right......but if OP tries it my guess is it will work as is. If it does not work reliably, especially when spinning the MPG at speed
then a buffer transistor would be indicated. My pendant needs to signal 24V, active low, consequently I fed the A/B inputs direct into the base of a small signal NPN transistor
and the collector pulled the 24V from the BoB low....and its perfectly reliable.

My guess is that OP would rather not use a transistor if it can be avoided......it represents a complication that non-electronic people shy away from.

Craig

859
General Mach Discussion / Re: Manual pulse encoder & mach3
« on: January 25, 2022, 08:02:56 PM »
Hi,
not a lot to it, just place a Zener across each input, it will limit the max voltage input to 4.7V, ie within the BoBs sweet spot.
Don't need a circuit board just the the Zener tail into the input screw terminal with the other lead going to COM. Note the band (polarity) of the Zener.

Quote
Lots show resistors used to?

Don't really need another resistor because of the output impedance of the AB outputs....don't you just love Thevenin's Theorem!

Craig

860
General Mach Discussion / Re: Manual pulse encoder & mach3
« on: January 25, 2022, 07:35:22 PM »
Hi,
I just pulled my pendant to bits and measured the short circuit current of the output, 1.5mA and an open circuit voltage
of 6.7V

The Thevinin impedance is:
output impedance= 7.7V/1.5mA
=4.66 kOhm

So not 10kOhm, about 1/2 that, 4.7kOhm.....still should not trouble the ESD diodes but if you put a 4.7V Zener across the the BoB inputs...that would be
nice.

Craig

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