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Battery Terminal Description Color

Positive 12 VDC Red

Negative Ground Black

Table 1. CSAT3 Power

Channel Description Color

C1 SDM Data Green

C2 SDM Clock White

C3 SDM Enable Brown

G Digital Gnd Black

G Shield Clear

Table 2. CSAT3 SDM Output to a CR23X datalogger

6. CSAT3 Output

The CSAT3 has three signal outputs: SDM, RS-232, and analog. During the Baltimore

Supersite Project the SDM output is used. SDM is a Campbell Scientific communication

protocol used between a Campbell Scientific datalogger and a smart sensor. This protocol

uses control ports 1,2, and 3 to communicate with the CSAT3. The datalogger

instruction, SDM-CSAT3 (P107), is used to communicate with the CSAT3 over SDM

bus.

7. Datalogger Programming using SDM

SDM-CSAT3 (P107) is an Input/Output instruction that controls and retrieves data from

the CSAT3. The wind data and the speed of sound (sonic virtual temperature) is scaled by

Instruction 107 into m/s or degree Celsius.

In Table 3 the SDM-CSAT3 (P107) instruction parameters are listed.

Parameter number Data type Default description

1 Integer Reps

2 Integer SDM Address

3 Integer Option

4 Real Ux input location

Table 3. SDM-CSAT3 (P107) instruction parameters

Reps: The number of CSAT3s on the SDM bus that will be sequentially addressed with

the SDM-CSAT3 (P107) instruction. For this experiment, one CSAT3 will be in

operation.

SDM Address: The unique SDM Address of the CSAT3 that the datalogger will

communicate with. The SDM Address is 3.

Option: Option 91 "trigger and get wind and speed of sound data" is used, which sends a

measurement trigger to the CSAT3 whose SDM address is specified in parameter 2. The

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Campbell CSAT3 Bedienungsanleitung Seite 5