Campbell Scientific CSAT3 CSAT3 3-D Sonic Anemometer - Page 19

CSAT3 Outputs

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CSAT3 Three Dimensional Sonic Anemometer TABLE 5-8. FW05/FWC-L35 Fine Wire Thermocouple Description Signal High Signal Low Color Purple Red 6. CSAT3 Outputs The CSAT3 has three signal outputs: SDM, RS-232, and analog. Campbell Scientific recommends that the SDM output be used when ever possible, followed by RS-232, and finally analog. TABLE 6-1 summarizes the difference between the three output options. In general SDM communications has the following advantages: lowest CSAT3 current drain, best control and diagnostics, and highest data resolution. TABLE 6-1. CSAT3 Outputs Typical Current Drain @ 10 Hz External Trigger Source Output Dynamic Range Diagnostics Available SDM 51 mA @ 12 Vdc yes 19 bit yes RS-232 89 mA @ 12 Vdc yes 19 bit yes Analog 99 mA @ 12 Vdc no 12 bit no 6.1 SDM Output SDM is a Campbell Scientific communication protocol used between a Campbell Scientific datalogger and a smart sensor. TABLE 6-2 lists all the Campbell Scientific dataloggers that support SDM communications, along with the required datalogger OS/PROM and CSAT3 embedded code. 11

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CSAT3 Three Dimensional Sonic Anemometer
TABLE 5-8.
FW05/FWC-L35 Fine
Wire Thermocouple
Description
Color
Signal High
Purple
Signal Low
Red
6.
CSAT3 Outputs
The CSAT3 has three signal outputs:
SDM, RS-232, and analog.
Campbell
Scientific recommends that the SDM output be used when ever possible, followed
by RS-232, and finally analog.
TABLE 6-1 summarizes the difference between
the three output options.
In general SDM communications has the following
advantages:
lowest CSAT3 current drain, best control and diagnostics, and
highest data resolution.
TABLE 6-1.
CSAT3 Outputs
SDM
RS-232
Analog
Typical
Current Drain
@ 10 Hz
51 mA
@ 12 Vdc
89 mA
@ 12 Vdc
99 mA
@ 12 Vdc
External
Trigger
Source
yes
yes
no
Output
Dynamic
Range
19 bit
19 bit
12 bit
Diagnostics
Available
yes
yes
no
6.1
SDM Output
SDM is a Campbell Scientific communication protocol used between a
Campbell Scientific datalogger and a smart sensor.
TABLE 6-2 lists all the
Campbell Scientific dataloggers that support SDM communications, along with
the required datalogger OS/PROM and CSAT3 embedded code.
11