Vaisala WMT52 - Manual (Page 75)

Chapter 7 __________________________________________________ Getting the Data Messages
VAISALA_______________________________________________________________________ 73
?!0<cr><lf>
Acknowledge Active Command (a)
This command is used to ensure that a device is responding to a data
recorder or another SDI-12 device. It asks a device to acknowledge its
presence on the SDI-12 bus.
Command format: a!
The response:
a<cr><lf>
Example:
0!0<cr><lf>
Change Address Command (aAb)
This command changes the device address. After the command has
been issued and responded to, the sensor is not required to respond to
another command for one second time in order to ensure writing the
new address to the non-volatile memory.
Command format: aAb!
where
a
= Device address
! = Command terminator
where
a
= Device address
<cr><lf> = Response terminator
where
a
= Device address
A = Change address command
b = Address to change to
! = Command terminator