5i25 7i76 Question
Clive s wrote: Ok I purchased these two cards together so I assume that it has been flashed with the correct firmware.
Yes, one think funny though, is that by default the 7i76 is set to source 5v from the PCI card, but the 6i25 is set to not send it to the break-out board
So whatever your choice is, you need to change a jumper.
The 6i25 is just a 5i25 with a PCIe to PCI bridge, so for LinuxCNC it only sees a 5i35 and this is OK.
Clive s wrote: I am only using one 7i76 but I don't see in the Pncconfig the option to use just one card it seems to say 5i35 x 2 7i76 would this be ok for an initial setup?
Todd Zuercher wrote: It would make sense to have the default jumper positions on the 5i25/6i25 be in the ground position
Yes, and it is the case
(My remark was that he 7i76 on the contrary expects by default to get 5v from the i25 -- so whatever your choice is you will have to change the one or the other)
24V (or whatever your decide) is for the field power.
But you also need power for the step/dir signals to your drives, in principle 5V. So the choice is between:
- Getting the 5V from your computer (changing the 6i25 jumper to provide 5V)
- Providing yourself 5V from another power source directly to the 7i76 (changing the 7i76 jumper to isolate the 5V)
I use 24V for field, and take the 5V from my 6i25, to avoid an additional PSU