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Do NOT use the COM motor wires on new drives!!!
Do NOT use 5 wire stepper motors with new drives!!!
New drives are always "bipolar" meaning each winding has it's own H-bridge.
Old drives were "unipolar" meaning each winding was driven by a single transistor/MOSFET to ground, while all 4 pins from one side of all 4 windings was wired to + (positive) of the power supply.
Use a DVM in OHM or BEEP mode to find out what wires belong to the same winding, and based on resistance you can also figure out the middle wire, see bellow:
-if you want max torque but lower rotation speed, use the two wires with most resistance, in your case use A1/A2 and B1/B2 and leave ACOM/BCOM unconnected. Do isolate them so they do not touch.
-if you want more speed at lower torque, use the middle wire and 1 of the remaining 2 wires, it does not matter which one, just one.

Hello,
I'm currently implementing a retrofit for our SHW UF31. So far, progress is pretty good. But I have a small problem with the gear selection.
I'm using Classic Ladder to shift the three gears. It works quite well so far. I have a float input for the spindle speed, which is used to select and engage the correct gear.

The plan is to use the S command to set the gear. But I don't know which HAL pin I can use to query the set speed without the spindle running.

So what I need is a way to read this system parameter in the HAL / Classic Ladder:
#<_rpm> - Return the current value of S, not the actual spindle speed.

Best regards, Stefan

Hi i want know if existe a command in terminal for read the value the hal pin, not in cyclic mode, but read value only at start the hal command interminal.

Do they show driver and module in use?
I would guess at yes... as the flags are only "medium devsel"

Model: PAR5408AXX200
Chipset: Sunix SUN1989
Interface: PCIe
Supports PS/2: YES
Supports EPP: NOT TESTED
Supports IN Mode: YES (in PS/2 Mode)
Supports X Mode: NO (Control port pins voltage drops to ~0,3 V when connected to ground through 470 ohms resistor, but pins states won't change)
Tested OS: linuxcnc-2.8.4 / Debian Buster
Tested Computer: Dell Optiplex 760

thank you guys, you helped me a lot, I realized that these are in fact stepper drivers and motors, the voltage is 45vdc, I will buy a simple stepper driver and try to connect phases a,a+,b,b+ and according to my understanding ``com'' I should short-circuit two pairs (wires) of aCOM and bCOM separately