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02-05-2012 #1
Pls do not confuse connector with port. PLCM-E3 have 3 output ports, pinouts are similar to LPT, but it doesn't mean that they are the same.
So if you have already built your box and you plug this in between what do you achieve except a hole in the wallet ?
Of course, if you absolutely satisfied with how do your CNC system works, you don't need PLCM.
But in most cases, due to PC motherboards' hardware issues, MS Windows and Mach3 architechture, output freq. on pins of PC's LPT-port is very unstable.
Who have such possibility - just use your oscilloscope to check this.
So, this causes a) step missing b) limiting maximum of speed and torque.
You can check this video: www.youtube.com/watch?v=3Gi2B2qUJ_k
This test shows that no-load max. rotating speed higher up to 40% with PLCM.
Also, there are one issue in mach3 with late changing DIR signal.
Also, i think most of Mach3 users know, how sensitive it is to Windows interrupts. Suddenly started screen-saver can make the part you're processing now into the garbage.
You can also check first question in our FAQ.Last edited by Purelogic R&D; 02-05-2012 at 06:07 AM.
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