If you need to connect a serial cable to a computer that doesn't have a serial port, then you need a USB to Serial adapter. 

It can be a challenge since there are many different models, types, and manufacturers. 

You need to find an adapter and a matching driver. We have tested cables with FTDI chip (FTDI-FT232RL) and corresponding drivers. In our tests we are using:

  • A USB/Serial Adapter from UGREEN: USB 2.0 to RS232 DB9 Adapter Cable (FTDI)
    • E.g., $13 at Amazon (remember you might need two cables) - the one shown below with FTDI-FT232RL.
    • PS: please note that UGREEN makes adapters with other chipsets as well. 

  • A Serial cable or a "modem female to female": DB9 null modem female to female slimline data transfer serial port adapter.

There are several other combinations (driver and processor chip, cables, etc.), but above should get you started without spending too much money.