Basic Mesa 7i76e Wiring Question

You are not using the encoder index input (IDX+ = TB3 pin 13) so its free
(you need to jumper it to TTL mode)

Diode spec is not very important but low drop

Not sure if you could use a relay, the Error/reset pin is low current AFAIK

PCW wrote: You are not using the encoder index input (IDX+ = TB3 pin 13) so its free
(you need to jumper it to TTL mode)

Diode spec is not very important but low drop

Not sure if you could use a relay, the Error/reset pin is low current AFAIK

Thanks for that PCW,

One more thing, What does SPARE S/D OUT mean?

Step/Dir

PCW wrote: You are not using the encoder index input (IDX+ = TB3 pin 13) so its free
(you need to jumper it to TTL mode)

Diode spec is not very important but low drop

Not sure if you could use a relay, the Error/reset pin is low current AFAIK

PCW,

I am trying to set up my drive fault detection from my Gecko 320X drives using the 7i76e encoder index pin to read the error/reset circuit as you suggested earlier in this thread,

I have wired TB3 pin 13 to link into the error/reset circuit and I have set W13 to TTL.

I cannot get the encoder input to change state in HAL Show when I apply power to the drives and when I fault them. Nothing under encoder changes in Hal show when I turn the drives off and on.

I think the 7I76E manual is wrong here. W10 sets the input mode for Index

I have changed the jumper settings and still cannot get anything to change state in the hal show,

What is I were to wire up the negative lead from the circuit to IDX- pin 14 on TB3 and set it to differential?

Will that work?

No, because its unlikely that the Gecko can drive the termination resistor

I would first check that you can change the state of the index pin in hal by grounding pin 13 (it should be pulled-up to 5V with a 2K resistor on the 7I76E so should idle high)

PCW wrote: I would first check that you can change the state of the index pin in hal by grounding pin 13 (it should be pulled-up to 5V with a 2K resistor on the 7I76E so should idle high)

Ok I checked Pin 13 by grounding it and it can be seen changing state in the Hal show.

Where do I look now? I really should of looked into the Gecko 320x more before I brought them, Its becoming a real pain in the ass to get these things to work properly.

Or maybe I am facing problems because the power supply for the reset/error circuit is coming from the drives themselves, would I be better off by wiring the circuit from the spare step and direction pins on the Mesa 7i76e?

Do you have a common ground between the Gecko and the 7I76E?

You should be able to just check the Gecko output voltage relative to 7I76E ground
with a DVM

PCW wrote: Do you have a common ground between the Gecko and the 7I76E?

I have checked and No I do not have a common ground, Is that all that my problem is? So wiring the circuit so that is has a common ground should solve the issue?