Following the guide to hookup the 340G to my laptop to access my Simultaneous RFID Tag Reader.
I have tried this with MacOS Mojave 10.14.4 and Windows 10 ( Bootcamp ).
MacBook pro mid-2014 laptop.
I’ve tried two different CH340G’s, Two different USB cables, and even tried this on another MacBook Pro … and so It’s not likely a cable or port hardware issue unless I’m really unlucky.
I can see 5V of power output from the breakout but the port is never recognized by the OS so I can’t perform the hardware test through a terminal.
I’ve rebooted several times, reset PRM. Sigh.
Have you made sure that you are using the right driver? You can try to update the driver to [version 1.5. There are instructions in the [hookup guide. However, if you have a driver version issue, usually, the OS runs into a kernel error and cause the OS to constantly reboot.
Otherwise, make sure you aren’t using a charging only cable. You can test the cable with a digital device, like a phone. If you can see your phone/device on the computer when connecting with the USB cable, then it allows data to pass through. If your computer doesn’t recognize your phone as a device, then it is a charging cable and only passes power… which would be why you get 5V, but your computer doesn’t recognize the CH340 chip.](https://learn.sparkfun.com/tutorials/serial-basic-hookup-guide#drivers-if-you-need-them)](https://cdn.sparkfun.com/assets/learn_tutorials/8/4/4/CH341SER_MAC.ZIP)
Drivers upgraded so not likely the issue. Power only cables what!? That might be it … as I only have devices which take a charge from these cables … headphones. Thanks for this lead I’m chasing it.
Resolved! Yes I was using “Power Only” cables … thank you for your prompt help!
Those get everybody!
Glad you got it working though. 