I had some trouble with the OXIDE laser 1064nn. When I change the computer to control it, I got a communication error with the serial port RS232.

This is the correct procedure to restart the laser and reestablish the communication with the computer.

1. Please turn off the all the elements. (PC, main switch of Laser, 
key switch of laser) 2. Disconnect USB-serial port from the PC.
3. turn of PC
4. Connect USB-serial port to PC and check corresponding COM port at 
device manager.
5. Start software
6. set corresponding COM port
7. set save file for log (This process must be done, otherwise the 
software does not work properly.) 8. Turn on main switch of the laser
    ==> after a few moment the communication between laser and PC 
would be established.
    ==> If the communication would work properly, turn on the key switch.