Vaisala WS425 - Manual (Page 55)

Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 55
Standard SDI-12 Commands Supported
by WS425
Acknowledge Active Command (a!)
This command is used to ensure that a sensor is responding to a data
recorder or another SDI-12 device. It asks a sensor to acknowledge its
presence on the SDI-12 bus.
The command is the following:
a!
where
a = The sensor address.
! = Terminates the command.
The response is the following:
a<CR><LF>
where
a = The sensor address. The default values is zero
(0).
<CR><LF> = Terminates the response.
The following is an example of the command:
0!
The following is an example of the response:
0<CR><LF>