How do I bind the e7w Thermostat to auxiliary devices like door sensors or the PC502.4G gateway?

Enter Service Mode and select the Io parameter to configure the I/O map (typically 0 for entry doors, 2 for windows/balconies). Press FAN to initiate Reverse Binding and press the Reset/Bind switch on the PC502.4G, or press the S1 switch on S541.RF door switches. The e7w will beep three times when binding is successful. (Pages 36-37)