An important part of Provox control system is a unit known as NIU which functions as software/hardware interface to connect engineering computer through Provox intranet. NIU is an obsolete device and the spare parts required for its maintenance are unavailable. In this project, NIU was replaced with HDL as a more advanced device in terms of hardware and software. Paya Control Afzar was also responsible for installation, commissioning and provision of licenses and required software.