code: def set_payload_format(self, payload_format):
          
          request = {
              "command": "payload_format",
              "format": payload_format
          }
          status = self._check_command_response_status(request)
          # Always change the format regardless because if it was already in the
          # right format, the command will have failed.
          self.format = payload_format
          return status
docs: Set the payload format for messages sent to and from the VI.
  
          Returns True if the command was successful.