A request can be received and a request reading level representation for the request can be inferred. The method includes implementing a debug logic circuit and connecting the debug logic circuit to a system on chip voltage source. The machine cab includes an HVAC duct system configured to move with the machine cab and seal with the HVAC unit of the work body. The receiving and source nodes are included in the network. In addition, a threshold used for switching an LUT is caused to be different depending on a switching direction between LUTs, thereby suppressing frequent occurrence of switching of the LUT.