I have seen that Link-OS SDK in not available for printer GK420d.
What is the SDK should I use to connect to GK420d printer?
I'm using RS-232 cable and I'm sending raw ZPL commands but, if available, I prefer to connect using official SDK.
The Link-OS SDK is supporting USB connections to Zebra printers. You may need to use USB-->RS-232 converter to print on your GK420d RS-232 printer with Link-OS SDK.
Software Engineer, Kutir Mobility
Posted on behalf of Zebra Technologies