UniData Communication Systems Starflow QSD Manual page 12

4.1.3 Extended Commands
To enable various settings and adjustments to be made to the Starflow QSD using SDI-12 eXtended
command aX!. The extended command format is:
Examine setting
Change setting
Where n = setting number to examine or change
0 – Sensor address in ASCII (aX0b! is the same as aAb! Command)
1 – Number of measurements returned by aD0! or aR0! Commands and the Sequence (order) of
returned measurements (parameter addresses)
2 – Min Battery (in 1/100s of Volts), below which water measurements are not made
+ Min Water Depth (in mm) below which Velocity will not be measured
+ Min RSSI (signal level) below which Velocity will not be measured
+ Max Signal Spread above which Velocity will not be measured
3 – Velocity Ripple Filter (in 0.75mm/s units) below which Velocity will be attenuated
+ Velocity Gain
+ Velocity Pre-Filter (0=none, 1= 33, 2=83, 3=167 mm/s) below which Velocity is attenuated
4 – Outlier Filter and Moving Average setting for Depth (Ultrasonic), CW Velocity, Conductivity and Depth
(Pressure)
5 – Set (+ve) and Reset (-ve) QSD 32 Options (0...31)
6 – Conductivity Temperature Correction Coefficient
7 – Pressure Depth zero Offset (for barometric compensation)
# - Restore Factory Default Settings
<values> = integer(s) with ± sign (no decimal point) or ASCII string (no ± sign)
Hint: If the Sensor has an unknown address, use the "?" wild card address along with the A or X0
command to reset a known address (e.g. ?A0! or ?X00! to reset the address to "0")
Unidata Manual - 6527B and 6537A Starflow QSD User Manual 17 01 2020.docx
Manual – Starflow QSD Model 6527B and 6537A
Command
aXn!
aXn<values>!
Response
a<values><CR><LF>
a<values><CR><LF>
Page 10