700-SDI-RADAR-300WL-Man Rev 2 11 Apr Mar 2022
28
/48
Part# 21371
Name
Command
Response and Details
Send
Identification
a
I
!
a13ccccccccmmmmmmvvvxxx . . . xxx
13 - the SDI-12 version number
cccccccc - 8 character vendor identification
mmmmmm - 6 characters specifying the sensor model number
vvv - 3 characters specifying the sensor firmware version
Start
Verification
aV!
One value is ready imminently.
0 indicates not ready
1 indicates ready
Verification values can be retrieved by the Send Data Command
Send Data
Send Additional
Data
aD0!
aD1!...aD9!
a+values
4.2.6
MEASUREMENT COMMANDS
This command tells the sensor to take a measurement. The sensor returns the time until one or
more measurements will be ready and the number of measurements that it will make. It does not
return the measurement to the data recorder after this command. The send data (D0!) command
must be issued to get the measurement(s).
COMMAND(S)
RESULTS
aM!
aMC!
aC!
aCC!
ammm9
ammm12
mmm = number of seconds before measurements will be ready
9 or 12 = number of values that will be returned (9 values for M command, 12
values for C (concurrent measurement) command)
aD0!
(for M and C
commands)
a±f±f+d+d+d
±f - discharge in defined units
±f - average velocity in defined units
+d - average SNR in dBm
+d - angle in dBm
+d - signal quality (3->unacceptable, 2 ->low, 1->good, 0->excellent)
aD1!
(for M and C
commands)
a±f±f+d±f
±f - relative level depending on sensor height in defined units
±f - distance from sensor to water in defined units
±d - level SNR in dBm
±f - standard deviation of water level in mm
aD2!
(for C
commands
only)
a±d+d+d
±d – internal device temperature in °C
+d – measured tilt angle of device in x direction
+d – measured tilt angle of device in y direction
