Experimental Physics and
Industrial Control System

Maren Purves via Tech-talk <tech-talk at aps.anl.gov> · Fri, 1 Oct 2021 08:35:58 -1000

As this is a serial line it can only have one connection.
Did you check that there isn't one before trying to connect?

Aloha,
Maren Purves

On Fri, Oct 1, 2021 at 6:19 AM Eric Norum via Tech-talk
<tech-talk at aps.anl.gov> wrote:
>
> Here’s a mention of the error message that you reported:
>
> https://groups.google.com/g/fa.linux.kernel/c/JyHCH2fq-wo?pli=1
>
> The final message in that thread says:
>
> The issue was udev loading smsc_ircc2. As soon as smsc_ircc2 is
> loaded, the serial port shows the behavior listed above. Unloading the
> module does not help, a reboot is needed.
>
> I have now solved the issue locally by blacklisting smsc_ircc2 and
> hope that I didn't break anything in this process.
>
> Other google search results on "LSR safety check engaged!” imply that perhaps something is messed up in the kernel.
>
>
> On Oct 1, 2021, at 4:33 AM, Hasan SANSAR via Tech-talk <tech-talk at aps.anl.gov> wrote:
>
> Hi all,
>
> We were using Glassman's HVPS with RS-232 serial port connection diretcly on CentOS 7.4 on MOXA DA-682A. And I updated CentOS to 7.9. after that MOXA PC started to not recognizing RS-232 serial connection. So, we are using High Voltage PS with TCP/IP converter  for temporary reason.
>
> I'm getting same error in here at tech-talk discussion:
> https://epics.anl.gov/tech-talk/2013/msg01079.php
>
> > drvAsynSerialPortConfigure("L0","/dev/ttyS0",0,0,0)
> > asynSetOption("L0", -1, "baud", "9600")
> > setOption failed tcsetattr failed: Input/output error
>
> How can I solve this problem and how can I connect to this device over RS-232 port again?
>
> .
>
> .
> .dmesg | grep tty
> [    0.000000] console [tty0] enabled
> [250769.622609] ttyS0: LSR safety check engaged!
> [251729.802651] ttyS0: LSR safety check engaged!
> [251733.905599] ttyS0: LSR safety check engaged!
> [251733.910846] ttyS0: LSR safety check engaged!
> [251734.006180] ttyS0: LSR safety check engaged!
>
> —
> Eric Norum
> eric at norum.ca
>
>
>
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System