SDMS-30 Multipoint Scanning Snow Depth Sensor
9
7.
Wiring
The cable/connector assembly provides all the required connections outlined
below:
•
12 - 15 Vdc, 2 Amp power supply
•
Full duplex RS-422 (RS-485) interface for external loggers
•
SDI-12 interface for external loggers
Align markers on the male and female connectors to plug in and fasten the
cable to the sensor.
Table 7-1, Table 7-2 and Table 7-3 outline assignments of wires of the
connecting cable. Use proper tools to connect the wires to the datalogger and
other devices.
TABLE 7-1 Firmware Update Wiring
Colo
u
r
Function
Connection to DB9
White*
Firmware Reset
Pin 4
Blue
RX
Pin 3
Yellow
TX
Pin 2
Brown
Ground
Pin 1
*Only use when resetting firmware.
TABLE 7-2 Power Wiring
Colo
u
r
Function
Connection
Red
Power
12V
Black
Power Ground
G
TABLE 7-3 SDI-12 Wiring
Colo
u
r
Function
Connection to
Datalogger
Green
SDI-12 Signal
C1/C3/…
Brown
Signal Ground
G
