2021-06-24

Author: Colin, Laurel

• We are assigning a static port for each of the PSUs
• Using python to figure out the ports that each device is connected to
  • python
  • > import visa
  • > rm = visa.ResourceManager()
  • > rm.list_resources()
• The small PSU is currently on ASRL/dev/ttyACM0::INSTR
  • Which is apparently shortened to: /dev/ttyACM0
• Following directions at this link: https://msadowski.github.io/linux-static-port/
• We ran
  • SINGLE PSU: udevadm info --name /dev/ttyACM0 --attribute-walk
    • ATTRS{idProduct}=049c (under the second parent device)
  • DOUBLE PSU: udevadm info --name /dev/ttyACM1 --attribute-walk
    • ATTRS{idProduct}=0460 (under the second parent device)
• Then, like with solution from 6/14/2021 eLog, we added to /etc/udev/rules.d/serial-ports.rules
  • ATTRS{idProduct}=="049c", SYMLINK+="psu1"
  • ATTRS{idProduct}=="0460", SYMLINK+="psu2"
• After a restart, these showed up when we ran "ls /dev/psu*"
• However, there's something about using the specific ASRL*::INSTR names from the VISA manager library thing that means this isn't the full solution.. So need to think about this some more.