I have 2 USB devices on my Raspberry PI, both Modbus as 1 reads my Solar equipment and the other reads an energy meter. At midnight my Pi reboots, and every so often I have to go into Node Red to change the /dev/ttyUSB1 to /dev/ttyUSB0 for my Solar equipment and then /dev/ttyUSB0 to /dev/ttyUSB1 for my energy meter. Is there a way that I can make /dev/ttyUSB1 to always be the same device please?
Have a look here:
A question - Why do you reboot at midnight?
I don't know if this applies.
but if these are serial devices - they will have a static entry in
so rather then pointing to
/dev/ttyUSBX point it to its
These ID's don't change and they are symlinks to
That was going to be my recommendation as well. That's how I've set up my two USB serial devices. Much easier and saves you faffing with setup.
It does! I had forgotten this! Works fine with me.
Thanks all. Will help me out that.
I just have a midnight boot on it as sometimes it becomes really slow to access remotely and found a reboot helps it out
A word of warning on USB devices. Some cheap clone serial donges don't have a serial number (and I think that can't add one either) so they just get added by the Linux sub-system in the order they respond. Real serial dongle have a serial number and each is unique so they can be properly handled by the USB subsystem.
Note: serial number != serial port.