7i84u - Mode 2, MPG and power connections

Trying to free up the high speed encoder function on my 7i96s by moving the pendant wiring all over to a 7i84u and might as well move all of the other pendant wiring over at the same time.

I read that if I run the 7i84u card in "mode 2" there are 2 spots on TB2 that set up as encoder channels (inputs 16-19)
Would that be two separate A/B single ended encoders or is that one A+/A- B+/B- differential like I have on the 7i96s ???   The pendant MPG has differential output

it also says that the thresholds automatically go to 2.5v to be compatible with MPGs.
Is that's regardless of field power level or not?

Currently I have Field A and B both at 24v, my original thought was  to use the split field power option and have field A be my 24v and move all of the axis selection, jog rate, e-stop pendant inputs  as well as the existing prox limit/home and output onto TB3
Then make field B into 5v and move all of the pendant wiring over from the 7i96s to TB2. I could tap into the VFIELD power input block TB1 for my power and ground for the pendant. I end up with a pile of 5v IN/OUTs that I'm not sure what to do with but maybe later


For switching to MODE 2, software selectable so from what I understand:
what I currently have in the HAL
loadrt hm2_eth board_ip="192.168.1.121" config="num_encoders=1 num_pwmgens=1 num_stepgens=3 sserial_port_0=0xxxxxxx" 

changes to:
loadrt hm2_eth board_ip="192.168.1.121" config="num_encoders=2 num_pwmgens=1 num_stepgens=3 sserial_port_0=2xxxxxxx"  



Anyway, looking for any input before I blow up my second 7i84u
Thanks





 

That looks correct except you do not change the number of encoders:
"num_encoders"  as this only applies to high speed encoders, not sserial devices.

Thanks for that clarification (never would have figured that one out)
Any guidance on the change to mode 2 creating two separate A/B single ended encoders or one A+/A- B+/B- differential ?
Thanks
M

There's no current way to support differential inputs on the 7I84/7I84U
I would just use a differential encoder single ended (just use A+,B+)

That's what I figured to try first. Wiring it up to make a 5v Field B right now and then I'll move the MPG over and try it
Thanks again,
M