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1  Third party software and hardware support forums. / PoKeys / Re: 56U incorrect motions on: March 26, 2015, 08:45:32 AM
Did you put any opto-couplers between the pulse generator (from our manual) and the Gecko drive?
It all sounds like a hardware fault of some kind.
2  Third party software and hardware support forums. / PoKeys / Re: 56U incorrect motions on: March 25, 2015, 03:08:55 PM
As I noted previously, check that you are using the correct step and dir signal polarity.
PoKeys generates motion in timeslots as it is also done by Mach3. Each timeslot (1 ms long) begins with DIR signal being set, then the step pulses follow in such a way that they are 'right-aligned'. To explain this: if one pulse is to be generated in the timeslot:
a) PoKeys internal pulse generator: 20 us before the timeslot end (980 us after setting the DIR signal), the step pulse will start and will be reset with the next timeslot
b) External pulse generator: step pulse will start in the middle of the timeslot and end with the next timeslot
Similarly, if 2 pulses are to be generated:
a) first pulse will be generated approx. in the middle of the timeslot and one at the end of the timeslot
b) first pulse will be generated at 25-50% and the second at 75-100% of the timeslot
And so on... As you can see, there is plenty of time (4us at the maximum speed) between DIR change and STEP pulse start - unless the STEP pulse polarity is inverted. In this case, the driver will interpret the pulse inverted and what should be the end of the pulse will be interpreted as the start of it. Since STEP and DIR outputs are refreshed at the same time in case of external pulse generators, there is no delay between STEP pulse being reset and DIR signal being set or cleared.
3  Third party software and hardware support forums. / PoKeys / Re: PoKeys57E Fast Encoder Problem on: March 25, 2015, 02:59:26 PM
We are quite busy working on the plugins and have little time to check the forums - our official support is only through emails at the moment.

We will check the issue with the decimals. Since the translation from floating point numbers to integers is done on PC (either in Mach3 or plugin), I am hopeful that this can be solved.
4  Third party software and hardware support forums. / PoKeys / Re: Re: 57E + cncaddon - grounds and wiring (servo AC808) on: March 25, 2015, 02:56:57 PM
Yes, GND pins are all internally connected on the PoKeysCNCaddon.
5  Third party software and hardware support forums. / PoKeys / Re: PoKeys57E Fast Encoder Problem on: March 24, 2015, 12:26:29 AM
So, is the issue related to jogging only or to job execution also?
6  Third party software and hardware support forums. / PoKeys / Re: PoKeys57E Fast Encoder Problem on: March 23, 2015, 01:24:02 PM
The problem is that all the motion calculation is done by Mach3 code by itself (disregarding the jogging motion) and PoKeys only executes the commanded moves (which are in the format of integer number of steps per each 1 ms timeslot).
7  Third party software and hardware support forums. / PoKeys / Re: 56U incorrect motions on: March 23, 2015, 01:19:47 PM
The PoKeys device outputs fixed pulses of 20 us when internal motion generator is used and variable length pulses when external motion controller is used - with the pulse width equal to 1/(2*f), where f is frequency of the requested pulses. At 125 kHz (maximum frequency supported) the pulses are 4 us wide, while at lower frequencies, the pulses are wider (longer).

Make sure that you connect STEP and DIR pulses of correct polarity.
8  Third party software and hardware support forums. / PoKeys / Re: 57E + cncaddon - DIR line is not working ? on: March 23, 2015, 07:29:08 AM
Can you give some more information on MCA808 drivers? The link to the manual?

PoKeysCNCaddon outputs single-ended 5V signals. What kind of input stage do the drivers have (standard optocouplers?)?
Have you taken into the account that PoKeysCNCaddon board is galvanically isolated from PoKeys?
9  Third party software and hardware support forums. / PoKeys / Re: 56U incorrect motions on: March 23, 2015, 12:04:43 AM
Do you have any circuit between the PoKeys and your stepper drivers? If you have a differential (- and + signals) input at your driver, check that you have the correct polarity.
What firmware version do you have installed on your PoKeys device?
10  Third party software and hardware support forums. / PoKeys / Re: A few question about Pokeys devices on: March 15, 2015, 11:35:47 PM
Usually PoKeys input pins are scanned as fast as possible by Mach plugin, but it is really hard to define what the scan rate actually is - something between 50 and 500 Hz.
However, some PoKeys pins support 'Digital counter' option, which is capable of counting the signals with frequency up to a couple of 100 kHz.
The values of these, however, are not accessible from Mach3 directly, but can be routed through PoIL shared data using PoBlocks (make sure to use 'Digital counter' block from 'IO' section). Using PoBlocks, you can create a closed-loop control of the spindle directly with Mach3 only setting the reference value via PoIL shared data slots.
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