It doesn't really matter much which bus you choose as long as it is headed in the direction you want to go. It's important to choose the right computer bus for your computer-controlled test system application. Making the right choice will help you save time and money, as well as perform more effective tests. Each PC, for example, comes with at least one serial port. You normally would use this port to connect a modem to the computer, but you can connect nearly any kind of device to a computer with a serial bus.
Some companies make test equipment that uses a serial port to transfer measurement data.
Using serial buses is the simplest way to transfer data, and because of this, there are some applications where a serial bus is your best bet. Also, because nearly every PC has a serial port, it's easy to connect a computer to the test equipment. One of their biggest disadvantages is that serial buses are relatively slow. These devices transfer data one bit at a time, meaning it will take eight separate transfers to move just one byte of data. Longer cables have more capacitance, and because the signal is a voltage signal, rise times are longer, thereby limiting the maximum data rate.