Hello every professor，I have one OBIS-355-20 LG laser，but I don't know how to powered this device because I don't have the pin definition of the DB26 port. Who know the pin definition of the DB26 port ?
If you look at the manufacturer's site they have a driver and software download. Doesn't say what OS so likely Windows, but you can try connecting to it with a serial cable.
If you don't have a serial port you can get one that's USB.