Converting a CNC interface +5 to common signal ground.

[dmauch]

I have a cnc ethernet controller for stepper motors. The controller signal outputs are step, direction and common +5 for signal return. However, The stepper motor drivers I have take inputs that are step, direction and common signal ground. Is there a circuit that I can use to convert the cnc interface common +5 to common signal ground?

 

[ronsimpson]

step, direction and common +5 for signal return

can you give us a part number, or more data on this.

 

[dmauch]

Its a chinese ethernet interface card NVEM v2 \. There is much help except that the outputs for each driver are +5, step pulse, direction pulse. And the step motor drivers are common signal ground, step pulse direction pulse. See the Geckodrive G540 .

 

[dmauch]

Would a 7404 work? I would input the +5 on pin 1 and output pin 2 would be connected to ground.?

 

[dknguyen]

What? This thing?
https://www.makerstore.com.au/download/publications/ELEC-NS-U-Manual.pdf

It says v1.1 though, not v2. This manual at least, does not match how you describe the stepper connections.

 

[dmauch]

It does look at section 2.2.1 then how it connects to a stepper motor driver in figure 2.3 But my drivers also have opto isolators and they require common signal ground. The NVEM shows +5 as the signal return path.

 

[dknguyen]

It does look at section 2.2.1 then how it connects to a stepper motor driver in figure 2.3 But my drivers also have opto isolators and they require common signal ground. The NVEM shows +5 as the signal return path.

Oh, I see how Figure 2-1 is supposed to mean now. Not the best labeling on that diagram IMO.

So the driver input is a common cathode LED input?

It's not clear to me what kind of stepper outputs the NVEM has.

 

[dmauch]

Yes here is the manual for the G540 https://www.geckodrive.com/amfile/file/download/file_id/22/product_id/14/. Page 7 You'll see that pins 18-25 are all signal grounds for the 4 axis inputs.