An Intelligent Power Supply (IPS) can operate on either AC or DC input power. If AC power is available, the system always uses AC power. The power supplies use AC power first and then switch to DC power automatically if AC power fails or is not present. When the AC power returns alive, the DC power source will convert to AC again. Such an IPS will consume less energy and be more cost effective in the industry. The development of an IPS needs a new version of the firmware for a universal interface of SAP (Systems, Applications, and Products) in data processing. The new version needs to provide a programming interface between an IPS and the computer. In this paper, the programming interface, iPort/AFM, is used to connect I2C host adapter with ASCII Fast Mode control. The iPort/AFM works with Windows or non-Windows based host computers. It supports both standard (100Kbps) and fast (400Kbps) Inter-Integrated Circuit (I2C) bus speeds with the I2C Interrupt signal. Controlled with a simple ASCII command interface, this adapter supports RS-232 with baud rates up to 115.2K/sec. It includes a high performance processor for improved throughput with low overhead. Moreover, the proposed interface can be used in DOS, UNIX, SGI, Windows, and Linux. The end product in industrial applications includes an adapter unit, software, cables, and a global power supply