The ?! command queries for the WMT700 address.
When you use a question mark (?) as the address character with the a! command, WMT700 responds as if it was being addressed on the SDI-12 bus. Regardless of its address, WMT700 responds to the command, which allows you to determine the address for the wind sensor.
|If more than one WMT700 is connected to the bus, they all respond, causing a bus contention.|
|!||Terminates the command|
|a||Single-digit WMT700 address that corresponds to the first character of the address value|
|<CR><LF>||Terminates the response|