Ive made some progress. 1st the cabel was OK but the 9to25 converter mades a cross connection so the TX went to TX so it did not worked at all. Ive soldered the fadals cable to work OK.
But there is a problem again. If i connect the serial cable to fadal it goes "nervous" the sound of the servo cards changes and the servos are jumping sometimes a bit. When sending data or fadal is sending to PC the sound goes normal again. but in IDLE connection the CNC is wispering...
It is a shielding , or grounding problem ? Or whats going on ?