Asrock Q1900B-ITX

macsddau@linuxcnc wrote:

tarasko wrote:

macsddau@linuxcnc wrote:

On an ASRock J3355B-ITX (celeron 2 cores) , I just add a MESA 6i25 to the config to solve latency problems and to remove stepping generation form the motherboard cpu. I have keep the same pinout as the parport.
the 6i25 was available form eusurplus fiew weeks ago. A little expensive with vat and shiping. 
Could you please advise where to get any info how to setup this mesa 6i25 (except basic linuxcnc documentation)
 

I use 5i25_prob_rfx2 conf.
Flashed 5i25_prob_rfx1.bit into the 6i25 card.
copy 5i25_prob_rfx2 files to some places (don't know if it is necessay but that's work) :

• 5i25_prob_rfx2.bit => /lib/firmware/hm2/5i25/
• 5i25_prob_rfx2.xml => /lib/firmware/hm2/5i25/
• 5i25_prob_rfx2.pin => /usr/share/doc/hostmot2-rimware-5i25/
  
  used pncconf
   
  
  
   
  
  AlA

Also please tell me if there a way to control a 24VDC relay with this board?

Is there any other profit from switching to Mesa board except the profit to not rely on software step generation? Is quality of microstepping better than software step generation?

tarasko wrote:

Is there any other profit from switching to Mesa board except the profit to not rely on software step generation? Is quality of microstepping better than software step generation?

Hardware step generation is smoother, and also has far finer granularity at high speed. 

If you have a 20,000ns base thread then you can step at 50kHz. Or 25kHz,16kHz, 12.5kHz etc.  But you can't do anything in-between. 
An FPGA board with a 10MHz base clock can do 50kHz, 49.990kHz, 49.980kHz etc. 

It doesn't always matter, especially with a machine that runs a long way from peak step rate. 
 

tarasko wrote:

Also please tell me if there a way to control a 24VDC relay with this board?

Yes there is if you are good with electronics, ir requires adding a resistor and a transistor, but must be very careful with wiring.
It would be simpler and safer to use a small SSR.
Wire the SSR input to Mesa output, the SSR output to 24V on one side and relay on the other side.
You would need a DC SSR, AC ones do not work with DC power.

Ohhhh been waiting for 4 days for this one to come back and spam, and predicatively, he did come back, so :
Spammer booted.