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Thank you very much. I found the problem.
With:
config="sserial_port_0=00000000"
the 7I84U boards are detected correctly.
At the moment I have only two 7I84U boards powered with 28V, and LinuxCNC detects both of them on channels 5 and 7:
hm2_7i97.0.7i84.0.5
hm2_7i97.0.7i84.0.7
So the 7I97T, 7I74, firmware, adapter and DB25 cable are all working correctly.
The main issue was that I was previously using:
config="sserial_port_0=x0xxxxxx"
and I had also misunderstood the physical channel numbering on the 7I74.
I will now power the other two 7I84U boards and test all four.
Thank you again for your help.

 

Left the first connector with all 4 5ABOB stepgens
(if you need the stepgen3 pins  as I/O, only
enable 3 stepgens  (0,1,2) in the hal file)

I have included the pinout source file in case you
want to make changes and compile a new bitfile yourself.

Well naturally, no problem found...

pcw@pcw-HP-Compaq-Elite-8300-USDT:~/bitfiles$ md5sum 7i97t_7i74d.bin
4130ebee623115267327c166f8da9d39  7i97t_7i74d.bin

7I97T with that firmware finds 7I84Us on all (1..7) 7I74 channels
7I74 channel 0 (lower left if facing the jacks) is not used with this firmware
as port 0 channel 0 is on the 7I97T card.

This is with our normal DB25M-IDC26 cable (and 7I74 powered over cable)

For external power make sure you have both the 7I74 and 7I97T Jumpered correctly:
7I97T W22 DOWN
7I74 W1 DOWN

Also note the 7I74 channel 1 is the top/left jack
facing the jacks, they are numbered:

1  3  5  7
0  2  4  6

2.7.15

ok. thank you very much

I can try duplicating this later today.

I used this two cables for connection. 

eusurplus.com/index.php?route=product/pr...t_id=108&search=db25
eusurplus.com/index.php?route=product/pr...t_id=109&search=db25

Thank you for your answer.

I would try:

config="sserial_port_0=00000000"

Might also be a DB25 cable issue, not all adapters are wired correctly for this use.

Hi,I am retrofitting a CNC lathe with LinuxCNC and I have the following Mesa hardware:

• 1x Mesa 7i97T
• 1x Mesa 7i74
• 4x Mesa 7i84U
• IDC26 to DB25 adapter
• DB25 male-male 1:1 cable between 7i97T P2 and 7i74
• standard straight-through CAT5e cables between 7i74 and 7i84U

The problem is that none of the 7i84U boards are detected over Smart Serial.The 7i97T is reachable at:I am using firmware:MD5:I also verified the firmware in flash with:and I get:gives only:but no 7i84U devices are listed.I tested 7i84U boards on CH1 and CH2 of the 7i74 with the same result.On the 7i84U:

• W3 = LEFT / operate mode / 2.5 Mbaud
• VIN = about 28 V
• VFIELD A = about 28 V
• VFIELD B = about 28 V
• CR2 ON
• CR7 ON
• CR5 red ON
• CR6 green OFF / never blinks

On the 7i74:

• CR1 is ON
• I initially measured only about 4.5 V
• I changed it to external regulated 5 V supply
• now TB1 measures 5.08 V
• the problem is still exactly the same

I checked the RJ45 cable and it is straight-through:I also tested the 7i97T P2 interface with W21 UP and P2 disconnected:Result:So that test appears to pass. also shows the expected Smart Serial signals: on the 7i97T and  for the 7i74 channels.I also tried loading HostMot2 manually:The 7i97T loads and registers normally, but the 7i84U is still not detected.Everything is new hardware.At this point I suspect either the 7i74 itself, the IDC26/DB25 path between P2 and the 7i74, or something I am missing in the Smart Serial configuration.Does anyone have a known-good 7i97T + 7i74 + 7i84U setup and can tell me what I should test next?In particular:

• Is 

  sserial_port_0=x0xxxxxx

   correct for a 7i84U connected to CH1 of the 7i74?
• Is there a direct test for TX/RX on the 7i74 without an oscilloscope?
• Are there any jumpers/settings on the 7i74 or 7i84U that I may have missed?

Thanks.

Should be this week.
 

beep boop... 

I have tried lcec configgen xml
Now I have got a new xml file as attached, but LinuxCNC doesn't start.
 

Typical of Python, the message is absolutely true and absolutely useless...
ValueError: invalid literal for int() with base 10: '' means that you are trying to use an empty string as an int variable, but it doesn't tell you where that empty string came from.
Of course, you can look for the cause for a long time and finally find that, for example, the disk is damaged...
I see that you have a very old Linux with Python 2.7 and instead of repairing this museum, you would be better off installing a new system on new hardware.
It may be easier, and it will definitely be better.

   
Sorry about that. Ive attached pics here.

Спасибо большое. На плату залита прошивка с сайта mesa (7i98_5abobx3d.zip - bit and pin), хотя плата неоригинальная. Приложил файлы с фото платы и распиновкой: old - что сейчас пока установлено, new - как нужно. Свободные пины на P3 буду использовать по концевики,  HOME, Estop и переключатели.