Campbell CSAT3, Instruction Manual

Page: 13 / 72

CSAT3 Three Dimensional Sonic Anemometer
5
3.2 DM Address
Each CSAT3 on the SDM bus must have a unique address. A hex thumb
switch within the electronics box is used to change the SDM address. Remove
the lid and orient the electronics box with the connectors pointing down. The
hex thumb switch is now located in the lower right hand side of the electronics
box (see TABLE 3-1 for SDM addresses).
SDM address F (hex) is a special address used during
a Group Trigger. Do not set the hex thumb switch to
SDM address F on the CSAT3’s CPU board.
TABLE 3-1. SDM Addressing Scheme
CRBasic
Datalogger
Address
(base 10)
EDLOG
Datalogger
Address
(base 4)
CSAT3
Thumb
Switch
(hexadecimal)
0 00 0
1 01 1
2 02 2
3 03 3
4 10 4
5 11 5
6 12 6
7 13 7
8 20 8
9 21 9
10 22 A
11 23 B
12 30 C
13 31 D
14 32 E
4. Installation
4.1 Orientation
The three components of wind are defined by a right handed orthogonal
coordinate system. The CSAT3 points into the negative x direction (see
FIGURE 4-1). If the anemometer is pointing into the wind, it will report a
positive u
x
wind.
In general, point the anemometer into the prevailing wind to minimize the
amount of data that is contaminated by the anemometer’s arms and other
supporting structures.
CAUTION