An improved casement window is provided which includes a tie bar and at least two tie bar guides through which the tie bar slidably extends. The diaphragm valve includes an elevating member which serves to make or break the direct contact of the metal diaphragm with the valve seat and which is fusion-bonded to the metal diaphragm. Series ON-resistance of the elements due to the substrate resistance is substantially reduced. The remote station may then scan for the WLAN service automatically or manually.