SDMS-30 Multipoint Scanning Snow Depth Sensor
10
TABLE 7-4 RS-422 Wiring
Colo
u
r
Function
Connection to
Datalogger
Blue
RX+
C1
Brown
RX-
C2
Yellow
TX+
C3
Jumper to Brown
TX-
C4
TABLE 7-5 RS-232 Wiring
Colo
u
r
Function
Connection to
Datalogger
Brown
Signal Ground RS-232
G
Blue
RX
C1/C3/…
Yellow
TX
C2/C4/...
7.1 Powering Up
The SDMS-30 requires a 12 – 15 Vdc power supply capable of providing up to
2 Amps continously.
To avoid shock or damage to the instrument, never
apply power while working on wiring and connections.
Never open the sensor when power is turned on.
Once mounting and wiring of the SDMS-30 are done (Section 11 Mounting
and Section 7 Wiring), apply power to the SDMS-30.
8.
Calibration
Once the SDMS-30 is fully installed, calibrate it for proper operation.
Calibration sets the height and angle of the sensor to ensure accurate
measurements. This occurs automatically (Section 8.1 Automatic Calibration)
or manually (Section 8.2 Manual Calibration).
8.1 Automatic Calibration
SDMS-30 supports a fully automatic calibration process. This process
automatically calculates the height and inclination angle of SDMS-30. If the
sensor is moved, it requires recalibration. This is done by issuing a calibration
request command (SDI-12 “aXA!” or RS-232 “@a”). When using the RS-232
command, the sensor will ask to confirm the request. Enter “y” to proceed.
Warning
