Re: High Voltage PS with RS-232 serial port

[Eric Norum via Tech-talk <tech-talk at aps.anl.gov>]

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