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  • mooser
  • mooser
14 Mar 2026 18:39
Replied by mooser on topic 7i84u - Mode 2, MPG and power connections

7i84u - Mode 2, MPG and power connections

Category: Driver Boards

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
  • PCW
  • PCW's Avatar
14 Mar 2026 18:19
Replied by PCW on topic 7i84u - Mode 2, MPG and power connections

7i84u - Mode 2, MPG and power connections

Category: Driver Boards

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+)
  • mooser
  • mooser
14 Mar 2026 17:33
Replied by mooser on topic 7i84u - Mode 2, MPG and power connections

7i84u - Mode 2, MPG and power connections

Category: Driver Boards

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
  • PCW
  • PCW's Avatar
14 Mar 2026 17:25
Replied by PCW on topic 7i84u - Mode 2, MPG and power connections

7i84u - Mode 2, MPG and power connections

Category: Driver Boards

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.
  • BIBIGUL
  • BIBIGUL
14 Mar 2026 17:16 - 14 Mar 2026 17:26
Linux cnc raw socket. was created by BIBIGUL

Linux cnc raw socket.

Category: Computers and Hardware

Question. If I use speculative memory access via _mm_prefetch (SSE instruction), does it affect the Linux CNC kernel? I am using this on RAW L2 Zero Copy sockets. I ran it, it seems to work, Axis (Linux CNC) doesn't break. Are there any restrictions on what can be used programmatically when writing drivers for Linux CNC?

Question 2.
int val = 1;
int re = setsockopt(soc, SOL_PACKET, PACKET_QDISC_BYPASS, &val, sizeof(val));

This forces Linux to bypass qdisc (queue discipline). This affects Wireshark; it stops capturing incoming packets, but they are still there. Could this affect Linux CNC? The Linux CNC kernel?
  • mooser
  • mooser
14 Mar 2026 17:14 - 14 Mar 2026 18:12
7i84u - Mode 2, MPG and power connections was created by mooser

7i84u - Mode 2, MPG and power connections

Category: Driver Boards

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





 
  • h.hermes
  • h.hermes
14 Mar 2026 16:19
Replied by h.hermes on topic RPi and 7i90 via SPI, estop

RPi and 7i90 via SPI, estop

Category: Driver Boards

Oh, I did not realize that there is a pcnconf utility. I used stepconf for my old machine, so hopefully this will work as well.
Deleting all the estop latch stuff did not work.
I will give pncconf a try next week.
Thank you for your help so far!
  • PCW
  • PCW's Avatar
14 Mar 2026 16:08
Replied by PCW on topic RPi and 7i90 via SPI, estop

RPi and 7i90 via SPI, estop

Category: Driver Boards

Not sure but something about the estop latch is is not working.

I would probable delete all the estop latch stuff as it's really not
needed here.

You might also be better off starting with a pncconf configuration


 
  • TAKUYA
  • TAKUYA
14 Mar 2026 14:48 - 14 Mar 2026 14:50
Replied by TAKUYA on topic Ethercat random jitter fix

Ethercat random jitter fix

Category: EtherCAT

So ive tried the new repo code and it still hasnt enabled dc-phase or shown any value for PLL-ERR or PLL-out except 0.

Im not sure if i plotted it correctly because i couldnt find the servo thread in halscope (is it servothread.time? ). However, please see attached image for pll-err and app-phase like requested.

Sync0Shfit was changed to 300000 aswell like you suggested
  • PCW
  • PCW's Avatar
14 Mar 2026 14:37 - 14 Mar 2026 14:43
Replied by PCW on topic Again about HOME_INDEX in step/dir mode

Again about HOME_INDEX in step/dir mode

Category: StepConf Wizard

Mesa Hostmot2 supports homing to index on step/dir systems.
It requires firmware that supports step/dir Index (normally
such firmware has "SDI" in it's name). It also requires one free
input per step/dir channel for the index signal.

This allows homing to index  and spindle synchronized motion  on
step/dir systems without encoder feedback to LinuxCNC.
  • TAKUYA
  • TAKUYA
14 Mar 2026 14:15
Replied by TAKUYA on topic Ethercat random jitter fix

Ethercat random jitter fix

Category: EtherCAT

I will give it a shot. Thanks for the Feedback regarding my files 
  • Atsu
  • Atsu
14 Mar 2026 13:58
Replied by Atsu on topic Ethercat random jitter fix

Ethercat random jitter fix

Category: EtherCAT

Thanks! Unfortunately I don’t have time to test this today, but will do it tomorrow at the earliest or Monday at the latest.
  • grandixximo
  • grandixximo's Avatar
14 Mar 2026 13:25
Replied by grandixximo on topic Ethercat random jitter fix

Ethercat random jitter fix

Category: EtherCAT

@ Atsu

I made a small change in my repo, get the new code, and make a new build then test, see if pll-err and pll-out get a value this time.
  • rdtsc
  • rdtsc's Avatar
14 Mar 2026 13:17
Debian Trixie and "onboard" on-screen keyboard - missing at-spi2-core was created by rdtsc

Debian Trixie and "onboard" on-screen keyboard - missing at-spi2-core

Category: General LinuxCNC Questions

Hi, just a note if you try
sudo apt install onboard
to use the on-screen keyboard, this will not work.  It results in:
(onboard:1747): dbind-ERROR **: 09:00:29.341: AT-SPI: Couldn't connect to accessibility bus. Is at-spi-bus-launcher running?
Trace/breakpoint trap

This is due to an unmet dependency.  
at-spi2-common
is included, but not 
at-spi2-core
.  Install that package also and onboard will then work.
  • Atsu
  • Atsu
14 Mar 2026 12:58
Replied by Atsu on topic Ethercat random jitter fix

Ethercat random jitter fix

Category: EtherCAT

@atsu

Your servo drivers support a period of 1250000

????


Yes, they should. The manual states the following:

In the work mode, the synchronization cycle must be an integer multiple of 125 μs. Otherwise, the servo
drive will report Er74.0 (EtherCAT synchronization cycle setting is incorrect.)


Initially, I ran the drives with a period of 1000000 ns, but increased it to the current value couple months ago. Did it because in some rare instances I got "Unexpected realtime delay on task 0 with period 1000000" error in UI. I can try lowering it back to 1000000 ns to see if it makes any difference.
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