There are some considerations regarding the danger of electrical voltages when using Serial Data Analyzer software. The ports use voltages that can cause substantial damage to unsuitable devices. Other, non-serial interfaces also make use of a 9 or 25 pin connector. You should not try connecting the interface if you are not certain it is, in fact, a serial port.
You can use a device known as a breakout box to identify serial interfaces in a safe manner. A meter can also be used to ascertain if the device is using ± 12 volts on the port’s DTR and RTS lines. You can also consult the device’s documentation to determine the purpose of the interface.
This software does not serve as a breakout box despite the presence of its line status indicators (LEDs). The output voltage is negative (-) 12 volts when the signals are inactive or low. This is a dangerous voltage with which to be testing.