UsbTerminal is a terminal emulator (sometimes called "monitor"). It uses the phone's or tablet's USB port to communicate with external devices. The phone or tablet must support USB-Host Mode a. K. A USB On-The-Go (USB-OTG), and a USB-OTG cable is required. Features: Support CDC-ACM based devices. Support FTDI based devices. Support Winchiphead-CH340/CH341 based devices.