Table 9-2: RS-232 command list
Command
usage
Default
value
Function
@t
⏎
n/a
Check and modify the current SDMS-40 time
* to modify the SDMS-40 time, type “@t”
⏎
and follow the instruc-
tions.
@ct xx
⏎
Where XX is
the new
threshold
25
Change Threshold CT represents the difference in depth for two
measurements in the same point
@vt
⏎
Where XX is
the new
threshold
15
Variance threshold VT is the difference in depth between two adja-
cent points in the same measurement
10. Maintenance and calibration
10.1 Maintenance
Regular cleaning and inspection is required:
l
Check to make sure the target area is free from any obstacles or foreign material.
l
Remove any dust or foreign deposits from the window of the SDMS40. Clean the window
glass with soft cleaning fabric or tissues, water, and soft cleaning detergents.
l
Inspect the bracket and other mounting clamps for loosened screws or clamps.
10.2 Calibration
Once the SDMS40 is fully installed, calibrate it for proper operation. Calibration sets the height
and angle of the sensor to ensure accurate measurements. This occurs automatically (
(p. 15)) or manually (
10.2.1 Automatic calibration
SDMS40 supports a fully automatic calibration process, which calculates the height and
inclination angle of the SDMS40. Calibration is required when you first set up the sensor and
SDMS40 Multipoint Scanning Snowfall Sensor
15
