USB to Serial on macOS Sierra not working I have been going in circles for two days trying to get macOS Sierra 10.12 to work with my Gigaware USB to Console (RS-232). I have tried about 10 different drivers from a google search with no luck. No matter what I do, the USB device will not show up under the TTY lines when plugged in.  

I have tried uninstalling and reinstalling all of the drivers as well as changing the vendor ID to match Prolific. I have also tried csrutil disable/enable command from safe mode and managed to see it in the network settings but it still isn't recognized by any terminal program that I have tried. Zterm, Zoc, other serial programs all fail.

Additionally, a program called "Serial" from Decisive Tactics Inc. seems to work, whatever drivers they load there work but I shouldn't have to pay 30 dollars for a feature that macOS should support. Any ideas on what I can do?  I'm all out of possibilities at this point and need some help. I've uploaded screenshots of what I currently have.
Install libusb >1.0 (actual 1.0.20) from homebrew or MacPorts, since this one provides access for controlling data transfer to and from USB devices in UNIX/non-UNIX systems, without the need for kernel-mode drivers.

As for a free application, try CoolTerm.

I used this combination with Cortex-M4 microcontrollers.