7i76 not seen by linuxcnc

P1 to P2 , or vice versa?

Well in this case 5I25 P3 (I/O0 .. 16) to the 7I76's P1

I tried a new parallel cable, same result. I checked continuity between all pins on both the original cable and the new one, and all pins were connected.

I flashed the 5i25 with 5i25_7i76x2.bit, just to be sure - same result, no smart serial pins indicated.

Is this more likely to be a fault with the 5i25 or the 7i76? Both seem to be working to send the stepper commands, which are routed through the 7i76 TB2 bank to Gecko 203v drivers. I suppose those may be routed directly from the P1 to TB2 so don't indicate the 7i76 is working.

The 7i76 is new, the 5i25 is old. I'm happy to buy a new one of whatever, I'm just getting tired of firing the parts cannon at this thing.

are you sure it's not the 7i76 that's not the problem.... I ask because the 5i25 is communicating with linuxcnc and setting up all its iOS..... indicating the 7i76 is not responding back to the 5i25.

.... dopy question... does the 7i76 have 5v power?..... sometimes best to stop and start at the beginning.

have you got anything else you can plug the 7i76 into to test? (it would need to be something from mesa with an IDC or lpt port on it

Good thoughts, Robert, not dopey at all. The 7i76 is brand new, and both LEDs are lit.

Pins 22-25 on the 5i25 P3 are GND, so I know it's not sending 5v to the 7i76. I'm putting 5V directly into the 7i76. The 7i76 is successfully driving the Gecko 203v drivers, which I take as evidence it's got 5V correctly.

I don't know how to test the 7i76 unfortunately. I'll probably just send both it and the 5i25 back to Peter and let Mesa do their magic.

is W2 on the 7i76 in the right hand or left hand position (should be in the right)

on the 5i25 W1 and W2 should be DOWN. if you are powering the 7i76 seperatly.

W3 should be UP on the 5i25

I suspect that W2 on the 7i76 is on the left..... and preventing the FPGA having a power supply....