Control & Measurement EUPP Modules - LCD Board The LCD board allows a standard LCD Display to be connected to the EUPP main board. As well as supporting alpha numeric LCD displays the LCD board supports LED back lighting of these displays, this back light can be switched on and off under software control. The LCD Display connects to the main board and occupies two of the 8 bit digital output ports. Therefore using a LCD board reduces the EUPP digital output capacity from 24 to 8.