FREHNIG FL-232 converter, has been designed for industrial use. Many devices use the RS-232 serial port for communication. Newer computers donot have serial ports as standard. When PCI cards are added the PC ground and the external device ground get connected and the chances of the PC getting damaged is very high. The FL-232 has isolation for both the data lines and the power and ground lines . therefore there is an inherent safety for your computer /Laptop. A simple driver installation, creates a virtual serial port in the . Multiple devices can also be added via various USB ports. The LEDs indicate power on and data transmit and receive status.