Vaisala WMT52 - Manual (Page 67)

Chapter 7 __________________________________________________ Getting the Data Messages
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The response:
b<cr><lf>
Example:
?<cr><lf>
0<cr><lf>
If more than one sensor is connected to the bus, see Appendix A,
Networking, on page 121 . If you need to change the device address, see
Changing the Communication Settings (aXU) on page 59 .
Acknowledge Active Command (a)
This command is used to ensure that a device is responding to a data
recorder or another device. It asks a device to acknowledge its presence
on the bus.
Command format: a<cr><lf>
The response:
a<cr><lf>
Example:
0<cr><lf>
0<cr><lf>
where
b
= Device address (default = 0)
<cr><lf> = Response terminator.
where
a
= Device address
<cr><lf> = Command terminator
where
a
= Device address
<cr><lf> = Response terminator