This is a download cable for ThermoKing IntelligAIRE II refrigeration unit.
This cable is used in conjunction with the IntelligAIRE II refrigeration units. One end connects to your ThermoKing unit, the other end connects to a standard serial port found on PC-based machines. This cable is used with early model InteligAIRE II systems that have a meta 5-pin connector. You would still need the ThermoKing software to utilize this cable, which is not included.
Note: If you do not have a serial port on your PC, you'll need the ThermoKing IntelligAIRE II Serial to USB Cable (420575) to connect via USB.