https://www.portrait.com/resource-center/ftdi-usb-to-serial-converter/
Using FTDI USB to Serial Adapters with Calman - Portrait Displays
Dec 18, 2025 - If a USB to serial converter is required to connect a device to a Calman computer, we recommend an FTDI brand converter. Extensive testing has determined that...
usb to serial adaptersusingftdiportraitdisplays