Retrofitting Realmeca need help

Hello everyone,This is my first message on this forum, I am currently retrofitting a CNC milling machine (see photo).With the help of a friend who advises me on the technical choices, I chose a Mesa 6i25 card and a 7i77 mounted on a Dell tower recovered at work.

The milling machine suffered damage the NUM was out of order

It took me a while to get my hands on all the gear.

I am asking you because some problems arise.-I changed the kernel from PREEMPT to RTAI, under PREEMPT I had an average latency around 20-25K, going under RTAI this figure should drop, it was not the case on the contrary, today I'm at 180-200K.

What do you think?

-I want to know if it is possible that the computer does not go to sleep, I can not find the command so that it never goes to sleep and asks me again for the password.

thanks you

I would not worry about the latency numbers. As long as you do not get real-time errors
they are not really important.

hello,

yet from what I read a latency of 200,000 is very high for RTAI....

I want to know if it is possible that the computer does not go to sleep, I can not find the command so that it never goes to sleep and asks me again for the password.

I'll try but I'm not strong on linux, would there be a tutorial?

I find it annoying that people choose a mesa card and still think they have to get the smallest latency number possible. I ran a machine with a 7i76e for years with latency of around 130k and the OP is worried that the latency is 25k ?
As PCW says, we need acceptible latency, not minimal latency! Revert to PREEMPT_RT and the problem is solved unles syou actually get errors

as for your other questions, look under power settings and security settings for screen saver and lock.

The auto logon needs editing a text file and this varies with your gui. If it is xfce which is what the linuxcnc ISO runs, try just googling "linux xfce auto logon"
Here is an example link
forums.debian.net/viewtopic.php?p=736982

Google can solve most linux config questions.

Hello, finally the latency is stabilized between 15 and 20K after several tests. I will therefore remain in RTAI. I don't understand what could have happened.

I tried to see my cards are well recognized by linuxcnc but I have the error message attached

I opened all the ports with the line in the .hal : 
loadrt hm2_pci config=" num_encoders=-1 num_pwmgens=-1 num_stepgens=-1 sserial_port_0=100xxx"

Looks like the 7i77 is not recognized?
it may be necessary to supply it with 24 V also so that the inputs / outputs are taken into account?
what color should the LEDs be, currently I have 2 in orange

thanks,
how to hook up the part field voltage monitor mesa 7i77?
I can't find it on the doc

If you mean enable 7I77 field voltage monitoring, you would need to set
sserial channel 0 to mode 2 or 3:

sserial_port_0=300xxx