Bluetooth Command mode

Dear All , Have a nice day?

I am trying to connect my HC05 Bluetooth module in to command mode and it is successfully connected and working Arduino Uno with Atmega16U2 USB driver .But it does not working with Arduino Uno with USB Driver CH340G

So it would be much appreciated if any one would advice the reason

Thanks in advance

PA3040

If you are using AT commands why would having a different driver be a problem?
It makes no sense.

Dear Sorry that I unable to explain it well,

I have two Uno Arduino boards one has CH340G USB driver and other one Atmega16U2 as USB driver Both boards are working. But when we test HC05 Bluetooth module command mode it only working one arduino board which driver having Atmega16U2 and command mode does not work for CH340G USB driver board

Please advice

Thanks in advance

PA3040:
I unable to explain it well,

That is true. Most HC-05s connect directly to Uno serial pins. So what is this USB driver stuff all about?

Dear Nick_Pyner,

The USB driver is CH340G

Please advice