Two of my lasers are connected to Lightburn, today one of them was running a job so I thought I would send another job to the second laser, I changed device in Lightburn to the second laser, when I tried to send the job over I got the message that the laser was busy. When the first laser finished I again tried to send the job to the second laser and it went to the first. Any idea what I’m doing wrong?
“My laser”? I’m not familiar with that model. 
Which controller type, and how are they connected?
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They are both running Ruida controllers and both connected by USB.
Serial/USB, or Packet/USB? Serial will let you choose the port, but packet doesn’t yet.