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Hey,

I have a Mesa 7i95t board that to my understanding has support for RS485.

I want to connect my Delta MS300 VFD to LinuxCNC over RS485, and I think I have two options:
* I've got a USB RS485 dongle that I can connect to the PC and to the VFD on the other end
* I can connect the Mesa board's RS485 terminals to the VFD

Which one of these options are preferable? Are both these options correct, and are there any pros/cons to either?

Thanks!

Guten tag zusammen,
Ich wende mich an euch weil ich den Anschluss vor lauter kabeln nicht mehr sehe.

Konkrekt geht es um 
4 x Step-Dir Servos
1 x -10 bis +10V Spindelservo
2-3 0-10V Spindelservo
8 Eingänge für je 2 Achsendschalter
4 Ausganänge für Bremsen

dann noch Aus und Eingänge für Allfälliges 

Die erste Kombi die mir eingefallen ist war 
7i92TH
7i77
7i90HD
7i85
die 7i77 und 7i90HD kann man über IDC26 P1 und P2 mit IDC26 -> DB25 verbinden
aber dann hat die 7i85 noch keine ansteuerung. Kann ich die auch an die 7i92TH hängen? wenn ja wie bitte oder braucht die 7i85 eine weitere 7i92TH

Das war so mein gedanke 
was würdet Ihr verwenden oder einsetzten 

Danke mal wieder für die hilfe und schöne grüße aus Österreich
 

i found a solution that worked.
i change inside my inverter to 0-5v input and adjust the potentiometer on the china pwm to analog pcb.
then i change the scale in the hal for the pwm.

50% 12000 rpm 203hz
100% 24000 rpm 400hz
75% 18000 rpm 305hz
25% 6000 rpm 101hz
12.5% 3000 rpm 49hz

it works for me

thanks guys

Thank you so much PCW

I do. I was able to get the Z stepper working, as it had a low voltage issue and was only able to jog in the up direction when I clicked on the jog arrows in config wizard. was also able to find the gantry config in the config setup when I opened Linuxcnc app. I am now needing to locate a helpful tutorial on Homing the joints. Have not found any yet. Can not do anything until this is done.
 

Actually, now that I have done more testing and fixed on issue in my ini file (had HOME_SEQUENCE=1 for all joints instead of 0), my original instructions at forum.linuxcnc.org/ethercat/54908-missin...-homing-lc10e#318671 appear to work correctly for homing LC10E drive with an external home switch on DI2.

-- Ralph

I thought you had a parallel port setup ( using stepconf to create configurations )

cnbbom wrote:

Hi, can you detail how you managed it, since other users have had problems? I'm having problems with rtai-modules-5.4.290_5.3.3-linuxcnc_amd64.deb
Another detail is that when I try to remove linuxcnc, I get another error. It says: Sub-process /usr/bin/dpkg returned an error code (1)
 

Guys, I found here what I needed to solve the problem, but when I open LinuxCNC, the screen goes black and restarts to the user login. However, I don't know if this is normal or if there is a problem, so I prefer to restart the machine.        forum.linuxcnc.org/9-installing-linuxcnc...ue-with-2-9-4#327437        

So which mesa board will I need as the one i have is 

Awesome thank you, I'll update and check that out tonight. 

I don't want to push my luck but would it be possible to have a dual timer plugin? It would be for lube pumps mainly, so generally they turn on when the machine starts, run for 10 seconds then off, and turn on for 10 seconds every 20 minutes after that. 

I guess the blink could be modified for longer frequency but both the on and off time needs to be adjustable.

Cheers.
Russell.

Hey guys I have been having a hell of a time trying to get closed loop pid tuning going, which i've done before pretty easily.The Z Axis seems to require over 500 P in order to have proper cmd-pos and fb-pos being in line or on target.No matter what I do I seem to get this crazy drift once im done pressing the job button.Maybe someone can help out?I have tried tuning to no end. The Z Axis has a shock which creates resistance from it falling downwards.Maybe my scale is incorrect or something else?The Servo Amplifiers use Digital PWM/DIR

   

the report from uname -a is
Linux Linuxcnc 6.1.0-30-rt-amd64 #1 SMP PREEMPT_RT Debian 6.1.124-1 (2025-01-12) x86_64 GNU/Linux

The 7I92 is intended to work with a separate breakout/daughtercard that
does things like buffer step/dir signals, accept 24V input signals from switches
etc etc.

You choose firmware that matches your breakouts (daughtercards) pinout.

When this is done, things like stepgens will be on the breakouts stepgen pins
and will be in a standard order like:

0  X
1  Y
2  Z
3  A
4  B

As long as you choose a similar daughtercard in pncconf or MesaCT, the
configuration should be usable. If the configuration utility does not have
a exact daughterboard match, there may be small details like GPIO pin
assignment for things like limit switches or spindle-on that require a
bit of hand editing of the hal file.

If you have a Benezan breakout, a G540 configuration should be close.

Thanks PCW. Sorry for the noobiness: I'm confused by the "daughterboard" terminology. I was hoping to be able to connect the DB25 male connector that comes from the lathe's control box directly into the DB25 female connector of the card. I'm confused because when I tried to use pncconf, I'm always asked about a daughterboard.

Is it correct to assume that in this case the daughterboard is the male connector from the lathe?

The benezan is not listed as firmware in the pncconf utility. Is it correct to assume that a firmware that has stepgens on pins 3 and 5 works? Or are there other criteria for choosing a firmware? 

i test it again.. 5v on pwm in gives 8-9v..same as from mesacard.. with 1khz 2khz and 3 khz..

i try it with 5v from a powersupply...

i think i must build a own circuit,,,,