Hi,

I am using linux panel PC CPi-A102WR with Codesys. I using two embeded serial ports by Edit the CODESYS configuration file

sudo nano /etc/CODESYSControl.cfg

[SysCom]
Linux.Devicefile=/dev/serial

And I have
COM1 - COM0(physical)
COM2 - COM1(physical)

Now I need more COM port, so I use USB to RS232 nad in the linux I have device : dev/ttyUSB0.

What I should modify in /etc/CODESYSControl.cfg file to using my device ttyUSBO like COM3 in codesys ?

/etc/CODESYSControl_Users.cfg

[SysCom]
Linux.Devicefile.1=/dev/serial1
Linux.Devicefile.2=/dev/serial2
Linux.Devicefile.3=/dev/ttyUSB0
Linux.Devicefile.4=/dev/ttyUSB1

You could also do symbolic link from /dev/ttyUSB0/1 to /dev/serial

sudo ln -s /dev/ttyUSB0 /dev/serial2
sudo ln -s /dev/ttyUSB1 /dev/serial3

Presuming you keep original .cfg file with Linux.Devicefile=/dev/serial, ttyUSB0/1 will then be available as COM3 and COM4.

@eschwellinger I should remove this lines :

[SysCom]
Linux.Devicefile=/dev/serial

from /etc/CODESYSControl.cfg file ?

I do this and add

[SysCom]
Linux.Devicefile.1=/dev/serial0
Linux.Devicefile.2=/dev/serial1
Linux.Devicefile.3=/dev/ttyUSB0

in empty /etc/CODESYSControl_Users.cfg file , but it doesn't work.

Solution with symbolic link works,until I restart my system.

What do we think about this solution.

I should create file :

/etc/udev/rules.d/70-persistent-serial.rules 

and put in it:

ACTION=="add|change", SUBSYSTEM=="tty", KERNEL=="ttyUSB0", \
  ATTRS{manufacturer}=="FTDI", ATTRS{serial}=="AK08GAMY", \
  SYMLINK+="serial2"



ACTION=="add|change", SUBSYSTEM=="tty", KERNEL=="ttyUSB1", \
  ATTRS{manufacturer}=="FTDI", ATTRS{serial}=="AK08G985", \
  SYMLINK+="serial3"

?

yes udev is the way to go. wether config rule works you must test on the device.

The above solution works great. I test it now