7i84 doesn't fault LInxuCNC when SSerial is interrupted

Hello,

I'm using a 7i96S with a 7i84U daughter board. Everything is working reasonably well except that when the smart serial fails Linuxcnc doesn't fault. I can manually restart the 7i84 by toggling the smart serial run pin but I was wondering if I missed something since linuxcnc continues to run with whatever the last values of the I/o pins on the 7i84.

LinuxCNC should report the error

If you need LinuxCNC to do a specific response to the error
you would need to set that up in the hal file

Hello PCW,

LinuxCNC does report an error as a popup, but I was wondering if there is a way to force a fault. There doesn't seem to be any pins that can easily be used.

The main way to do it that I see is checking the state of the hm2_7i96s.0.sserial.port-0.port_state pin and generating a misc fault if it is no longer in the run state (which appears to be 0x3).

Is there a cleaner way of doing that? The only 7i84 pins in HAL that show up are just I/O.

I've attached a txt file listing all of the mesa pins.




 

You could also use some threshold (> 200?) on  the fault count pin

You should also find out why you are getting sserial faults, in general these should never happen

I also think it's actually a bug if run is not cleared when all communication is lost and LinuxCNC
gives up

Ah thanks that might be a better option!

The smart serial error was likely due to a bad cable connection which has been fixed, but my main concern was ensuring motion could stop if something happens to the smart serial connection.

The run pin didn't seem to clear. It makes sense that the 7i84 I/O pins stop updating but I didn't think the smart serial run pin changed either. I'll double check and post back, but it didn't look like the run pin went low when smart serial was interrupted.

Thanks again for the quick reply! Merry Christmas!

I guess if you wanted to be really safe, you could loop back a free output
to an free input and put a watchdog signal on the output and use LinuxCNC's
watchdog component to trigger a fault if the output ceases to toggle.