Need Help!- G251 ground connection

[awilcox]

Before I fry a second driver I thought I would ask the group. How do you wire terminal 12 on the g251? The documentation states logic ground and I am slightly confused as to what it means. I have a c10, rev7 bob.

Any help would be greatly appreciated.

Adrian

[Jay C]

Here is how I wired mine to the C10


There is a jumper on the C10 to set the COM terminal to 5V or GND. I set mind to GND. Also mine is the C10 revision 8.2 and the inputs have 4.7K ohm pull own resistors. I had to cut them out and use pull up resistors on my inputs. Also, this is the very first revision of the G250 so it required a 100 ohm resistor on the logic ground ... I don't think it's required any more.

I am attacking a higher-res image if you need it.

-Jay

[awilcox]

Jay,
Thanks for the helpful information.

The rev 7 bob doesn't have a jumper fror the 5v/gnd function. I am assuming if I connect to this terminal and I do not send a 5v signal, then it defaults to gnd. Is my thinking correct?

Thanks once again!

Adrian

[Jay C]

I wouldn't assume anything. I don't see the v7 manual on the cnc4pc website. My suggestion aside from sending an email to them for confirmation is to use a multimeter and look for continuity between GND and the COM. I suspect that you are supposed to connect either 5V or GND to one of the COM pins. That way all of COM's will share the same logic level.

[awilcox]

I sent an email yesterday but I haven't heard from them. I have a mm so I can check continuity. When you say gnd to com, which gnd are you referring to (5v input or next to enable input)?

Adrian

[Jay C]

Yes, the GND from your input power source.

[awilcox]

Thanks, can't be too careful.

Adrian