ll = SDI-12 version number (indicates compatibility)
cccccccc = 8-character vendor identification
vvv = 3 characters specifying the sensor version (operating system)
xxx…xx = Up to 13 optional characters used for a serial number or other specific sensor
information that is not relevant for operation of the data logger
<CR><LF> = terminates the response
B.1.3 Start verification command (aV!)
The response to start verification (aV!) can include hardware diagnostics, but like the aI!
command, the response is not standardized.
Command: aV!
Response: atttn<CR><LF>
Where
a = sensor address
ttt = time, in seconds, until verification information is available
n = the number of values to be returned when one or more subsequent D! commands are
issued
<CR><LF> = terminates the response
B.1.4 Address query command (?!)
Command ?! requests an address of the connected sensor. The sensor responds to the query
with the address, a. This command should only be used with one sensor on the SDI-12 bus at a
time.
B.1.5 Change address command (aAb!)
Multiple SDI-12 sensors can connect to a single SDI-12 terminal on a data logger. Each device on
a single terminal must have a unique address.
A sensor address is changed with command aAb!, where a is the current address and b is the
new address. For example, to change an address from 0 to 2, the command is 0A2!. The sensor
responds with the new address b, which in this case is 2.
NOTE:
Only one sensor should be connected to a particular terminal at a time when changing
addresses.
MetSENS-Series Compact Weather Sensors 27
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