Are you sure that ttyUSB3 is the correct port. I don’t have access to a SL8082T at the moment but I believe that ttyUSB2 should be used. Easiest to check is to use minicom and send some at commands manually.
Are you sure that ttyUSB3 is the correct port. I don’t have access to a SL8082T at the moment but I believe that ttyUSB2 should be used. Easiest to check is to use minicom and send some at commands manually.