CSAT3B Three-Dimensional Sonic Anemometer
20
Internal Monitor Measurements
Update Rate:
2 Hz
Inclinometer Accuracy:
± 1 °
Relative Humidity Accuracy:
± 3% over 10
−
90% range
± 7% over 0
−
10% range
± 7% over 90
−
100% range
Board Temperature Accuracy:
± 2 °C
6.2 Communications
SDM:
Used for data logger based data acquisition.
Bit Period:
10
µ
s to 1 ms
Cable Length:
7.6 m (25 ft) max @ 10
µ
s bit period
76 m (250 ft) max @ 1 ms bit period
Address Range:
1 – 14
Bus Clocks per Sample:
~200
CPI:
Used for data logger based data acquisition.
Baud Rate:
50 kbps to 1 Mbps
Cable Length:
15 m (50 ft) max @ 1 Mbps
122 m (400 ft) max @ 250 kbps
853 m (2800 ft) max @ 50 kbps
Address Range:
1 – 120
Bus Clocks per Sample:
~300
RS-485:
Used for anemometer configuration or computer-based data acquisition.
Baud Rate:
9.6 kbps to 115.2 kbps
Cable Length:
305 m (1000 ft) max @ 115.2 kbps
610 m (2000 ft) max @ 9.6 kbps
Bus Clocks per Sample:
~500 (ASCII formatted)
USB:
Used for anemometer configuration or computer-based data acquisition.
Connection Speed:
USB 2.0 full speed 12 Mbps
Cable Length:
5 m max
6.3 Power Requirements
Voltage Requirement:
9.5 – 32 VDC
Current Requirement (10 Hz Measurement Rate)
Current @ 12 VDC:
110 mA
Current @ 24 VDC:
65 mA
Current Requirement (100 Hz Measurement Rate)
Current @ 12 VDC:
145
mA
Current @ 24 VDC:
80 mA
i
For additional details, refer to CSI whitepaper “Designing Physical Network Layouts for the CPI
Bus”