Just to clarify, the transmitter ID you use is set by the dip switches in the remote transmitter. You mentioned this is #3. The temp and humidity values that VWS returns are called "Channel X Temperature" or "Channel X Humidity" where 'X' is between 1 and 4. These values come from the corresponding position you plug the temp/humidity sensor wires into in the remote transmitter. On my system, my transmitter uses ID #3. I have 2 temp and humidity sensors in the first 2 sensor slots of each type. These show up in VWS as Channel 1 Temperature, Channel 1 Humidity, Channel 2 Temperature, and Channel 2 Humidity.
Steve