Control & Measurement EUPP Modules - LED Display The LED display utilizes a proprietary board which holds four 0.8 inch seven segment LED displays and two discrete LED's. The display includes a 40 way IDC header which accepts a 40 way appropriately terminated cable, this cable links the display to the main board, the 40 way cable length will be provided to suit application. The behaviour of the display and function of two discrete LED's are all controlled by the software running on the main board and will vary depending on the application.