How do I bind auxiliary devices like door switches and RF gateways to the e7w thermostat?

To bind RF devices (S541.RF door switches) or RF gateways (PC502.4G), enter SERVICE MODE, select the Io parameter, press MODE, set the I/O map value (0 for entry door, 2 for windows), press FAN to initiate binding, and press the bind switch on the target device. For door switches, press the S1 switch; for gateways, use a straightened paper clip to press the Reset/Bind switch. The e7w will beep three times when binding is successful. (Page 36-37)