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SR50AT-Series Sonic Ranging Sensors
15
TABLE 8-2. SDI-12 Commands
SDI-12
Command
Command Function/Description
Values Returned
aM!
Distance-Met
re
s
D
aM1!
Distance-Met
re
s, Quality Number
D, Q
aM2!
Distance-Met
re
s, Temperature °C
D, T
aM3!
Distance-Met
re
s, Quality Number, Temperature °C
D, Q, T
aM4!
Snow Depth Met
re
s, Quality Number, Temperature
SD, Q, T
aM5!
Distance-Inches
D
aM6!
Distance-Inches, Quality Number
D, Q
aM7!
Distance-Inches, Quality Number, Temperature °C
D, Q, T
aM8!
Snow Depth Inches, Quality Number, Temperature
SD, Q, T
AM9!
Temperature °C
T
aMC!
aMCn!
Measurement Commands with Checksum
See aM and aM1-aM8
Output is the same as aM,
aM1-aM9
Checksum is added
aC!
Concurrent Measurement Command
Distance-Meters
D
aCn!
Concurrent Measurements
Same as M1-M8
Output is the same as
M1-M8
aCC!
aCCn!
Concurrent Measurement Commands with Checksum
See aM and aM1-aM8
Output is the same as aM,
aM1-aM8
Checksum is added
aD0!
Send Data
Dependent upon command
sent
aV!
Verification command
S1, S2, V, WD
S1 = Firmware Signature
S2 = BootRom Signature
V = Supply Voltage
WD = Watch Dog Errors
aI!
Send Identification
013CAMPBELLSR50A 2.0SN
SN = Serial number (5 digits)
?!
Address Query
a
aAb!
Change Address command
b is the new address
aXM;D.DDD!
Extended
command
Set the distance to ground parameter in the SR50A.
The distance must be in met
res
with no more than three
decimal places.
a
Address is returned
aXI;DDD.DD!
Extended
command
Set the distance to ground parameter in the SR50A. The
distance must be in inches with no more than two decimal
places.
a
Address is returned