USB

The Universal Serial Bus is a serial bus system for interfacing a PC with other peripherals. It's based on differential data transfer. The bus topology is a strict master-slave communication (Exception: On the Go devices). In the case of EA uniTFTs-Series the PC/Master needs to coordinate the communication. The module has a CDC (Communications Device Class) and is found by Windows PC's as a virtual COM-Port:

Description	Value
Device Class	2
USB Vendor ID	0x2DA9
USB Product ID	0x2454
Device description	EA uniTFT

To program the module, adjust settings or to perform initial tests, we recommend using the USB interface. It's easy to connect, the transfer rate is fast and no interface parameters need to be specified. The driver for Windows can be downloaded on our web-page: http://www.lcd-module.de/fileadmin/downloads/EA_CDCdriver_V5_2.zip

Attention:

A protocol has to be used in USB CDC mode. It's impossible to use the USB interface without a protocol, which means pin 22 (primary connector) must not be set to GND. The high-speed connection of USB leads to buffer overflow, which are prevented by the protocol.