Each VXC card is equipped with a COM-Selector (Dip Switch) for the COM port number selection (automatically or manually). It’s an important and innovative feature for the VXC family.

The COM-Selector provides the following advantages:
◆ Simplifies the COM port number selection instead of using configuration utility programs.
◆ Users can specify the COM port number of the VXC card as exactly what they want, no matter which PCI slot it is located at.
◆ Automatically selecting an available COM port number is supported by setting the COM-Selector (dip switch) to 0 (default).
◆ No need to install configuration utility and to study its operation for different OS.
◆ Prevents confusion. Other PnP COM port devices easily confuse users because of adopting the dynamic COM port number setting.
◆ Easy replacement of an existing card by setting the dip-switch to be the same COM port number.
◆ Great for mass system installation; since setting the dip-switch to be the same COM port number is very easy.

The VXC cards offer TVS diode ESD protection technology, protecting your system from being damaged by the high potential voltages.

Under normal operating conditions, the TVS diode presents high impedance (appears as an open circuit) to the protected component. When the voltage is beyond the limits, the TVS diode avalanches providing a low impedance path for the transient current. As a result, the transient current is diverted away from the protected components and shunted through the TVS diode. The device returns to a high impedance state after the transient threat passes.

Some VXC cards offer photo isolation to protect your computer and equipment against damages in harsh environment.

Photo coupler is a device that uses a short optical transmission path to transfer a signal between elements of a circuit, typically a transmitter and a receiver. This keeping them electrically isolated — since the signal goes from an electrical signal to an optical signal, the electrical contact along the path is broken.

It can help cutting down on ground loops, common mode voltages and block voltage spikes, provide electrical isolation, and offer significant protection from serious over-voltage conditions in one circuit affecting the other.

VXC Cards are equipped with 16 or 128 bytes hardware FIFO for each port. Large hardware FIFO is useful to prevent data lost when your system works on heavy loading, and even helpful while you are running on a multi-task operating system, such as Windows, Linux…etc.