docs: def expander_to_zone(self, address, channel, panel_type=ADEMCO):
          """
          Convert an address and channel into a zone number.
  
          :param address: expander address
          :type address: int
          :param channel: channel
          :type channel: int
  
          :returns: zone number associated with an address and channel
          """
  
          zone = -1
  
          if panel_type == ADEMCO:
              # TODO: This is going to need to be reworked to support the larger
              #       panels without fixed addressing on the expanders.
  
              idx = address - 7   # Expanders start at address 7.
              zone = address + channel + (idx * 7) + 1
  
          elif panel_type == DSC:
              zone = (address * 8) + channel
  
          return zone