Experimental Physics and
Industrial Control System

"Peterson, Kevin M. via Tech-talk" <tech-talk at aps.anl.gov> · Fri, 7 Jun 2024 15:54:21 +0000

On my RHEL9 system, /dev/ttyUSB0 also has an entry in /dev/serial/by-id/ that doesn't change when the computer is rebooted:

[hostname ~]$ ls -l /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 May  7 06:35 /dev/ttyUSB0
[hostname ~]$ ls -l /dev/serial/by-id/usb-Prolific_Technology_Inc._USB-Serial_Controller_D-if00-port0
lrwxrwxrwx 1 root root 13 May  7 06:35 /dev/serial/by-id/usb-Prolific_Technology_Inc._USB-Serial_Controller_D-if00-port0 -> ../../ttyUSB0

Kevin

________________________________________
From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Ralph Lange via Tech-talk <tech-talk at aps.anl.gov>
Sent: Monday, June 3, 2024 2:18 AM
To: EPICS Tech Talk
Subject: Re: OMS MAXnet

On Mon, 3 Jun 2024 at 06:46, Jörn Dreyer via Tech-talk <tech-talk at aps.anl.gov<mailto:tech-talk at aps.anl.gov>> wrote:

My recommendation would be to take two small SBC e.g. RaspberryPi and connect each MAXnet controler via a USB2serial adaptor to its own SBC.

Another common option is using a "console server" or 'terminal server". These are COTS boxes that connect multiple serial lines (RS-232, RS-485) to TCP/IP, typically assigning a dedicated port to each serial line.

Many installations use "MOXA boxes" (MOXA NPort 6000 series terminal servers), but there are other vendors with similar products. Such boxes are industrial hardware, combining robustness and high availability with low management and maintenance effort.

On the IOC, the drvAsynSerialPortConfigure is replaced by drvAsynIPPortConfigure. That's typically all that needs to change.
And as that IOC only does network IO, it can easily be moved to a virtualized host, possibly removing the need for your CentOS PC.

Cheers,
~Ralph

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System