Something I have not tried is bringing up the VM and seeing if I can use the COM port under Linux. Short of uninstalling the VM software (which I really don’t want to do) I am not sure what to try next. I double checked and the serial ports on the VM are disabled and the VM software is not started or running unless I explicitly do it, so I don’t really think it is the culprit, but it’s all I can think of right now. One thing that I even remotely suspect is that I loaded Oracle’s VM VirtualBox software and installed a Linux environment. If I had had this machine for some time I might suspect I downloaded something some time that is causing the problem, but it is only a few weeks old and I have not had too much of a chance to crap it up yet. I tend to agree with you that this is something simple that is just eluding us. On latest operating systems, such as Windows 10 or Linux Ubuntu, device drivers will be installed automatically when you plug USB into computer.Tried procexp and nothing showed up in the search box for ProlificSerial. Next step is to install drivers for FTDI chip. Now plug USB cable with your laptop or computer. Also, connect GND a pin of FTDI with GND pin of HC-05. In this connection diagram, we connect a Tx pin of HC-05 with RxD pin of FTDI cable and Rx pin of HC-05 with TxD pin of FTDI cable. First, make connections with the HC-05 Bluetooth module and FTDI cable according to this schematic diagram. In this section, we see a demo to use FTDI cable to transfer data between the HC-05 Bluetooth module and computer using this USB to serial converter. Above information is provided just for your information. We do not need to worry about these USB pin details. This is connected to the case of the host PC.
Shield: This is sheet outside the connector and used to prevent electromagnetic interferences from other devices to prevent data from manipulation.Ground: This is a power pin and provides a ground signal of power from a USB Hub or HOST.D+: This is a bidirectional pin and is used as a data signal for USB.D-: This is a bidirectional pin and is used as a data signal for USB.
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