so I tried, I put the right port in kstars(/dev/ttyACM0), but it didn't work, and I got this message.
2020-11-18T17:41:57: [INFO] Error retrieving data from NightCrawler, please ensure NightCrawler controller is powered and the port is correct.
2020-11-18T17:41:57: [INFO] Focuser Type 3.5 NC
or then there is something that I do wrong, should I configure something in the code according to the port?
and do you have a schematic of your setup
thank you for your help, it's nice to take time for me !