Campbell CR10 PROM Instruction Manual download pdf (Page 15)

CSAT3 THREE DIMENSIONAL SONIC ANEMOMETER

hygrometer, the thermocouple and hygrometer

data must be shifted back in time two triggers.

This can be done on-line with a datalogger.

10. DATALOGGER PROGRAMMING

USING SDM

10.1 SDM-CSAT3 (P107) USED WITH CR23X,

21X, OR CR10(X)

SDM-CSAT3 (P107) is an Input/Output

instruction that controls and retrieves data from

the CSAT3 (see Table 10-1). This instruction is

available on the CR23X, 21X (with CSAT3

PROMs, P/N 10006), the CR10X, and the CR10

(with library special PROMs).

TABLE 10-1. SDM-CSAT3 (P107) Instruction

Parameters

PARAMETER DATA DEFAULT

NUMBER TYPE DESCRIPTION

01: 2 Reps

02: 2 SDM Address

03: 2 Option

04: 4 Ux Input Location

Reps: The number of CSAT3s on the SDM bus

that will be sequentially addressed with the

SDM-CSAT3 (P107) instruction.

SDM Address: The unique SDM Address of the

CSAT3 that the datalogger will communicate

with. The CSAT3 address is entered as a base

four number in parameter 2 (see Table 3-1).

The SDM Address is sequentially incremented if

the Reps option is greater than 1.

The wind data and the speed of sound (sonic

virtual temperature) is scaled by Instruction 107

into m s

-1

or degrees Celsius.

CAUTION: SDM address 33 (base 4) is a

special address used during a Group

Trigger. Do not program the datalogger to

address SDM address 33.

Option 1, 2, 3, 5, 6, 10, 12, 15, 20, 30, and 60:

“Set Execution Parameter” tells the CSAT3

which measurement parameters to use and

what frequency to expect the measurement

trigger from the datalogger. The datalogger

Execution Interval and the appropriate CSAT3

Execution Parameter is summarized in Table

10-2 and 10-3.

Option 61 and 62: "Set Execution Parameter"

tells the CSAT3 to oversample (Section 8.1.2)

the wind measurements at a rate of 60 Hz and

expect a trigger at a rate of 10 Hz (option 61) or

20 Hz (option 62) from a CR23X or 21X

datalogger.

Option 51 and 52: "Set Execution Parameter"

tells the CSAT3 to oversample (Section 8.1.2)

the wind measurements at a rate of 48 Hz and

expect a trigger at a rate of 8 Hz (option 51) or

16 Hz (option 52) from a CR10(X) datalogger.

Option 0, 90: “Trigger and Get Wind & c Data”

sends a measurement trigger to the CSAT3

whose SDM address is specified in parameter 2.

The CSAT3 also sends data to the datalogger.

Option 91: “Trigger and Get Wind & T

Data”

sends a measurement trigger to the CSAT3

whose SDM address is specified in parameter

2. The CSAT3 also sends wind speed and the

sonic virtual temperature (defined in Equation

(9) in Appendix C) via the SDM bus to the

datalogger.

Option 92: “Trigger and Get Wind & c-340

Data” sends a measurement trigger to the

CSAT3 whose SDM address is specified in

parameter 2. The CSAT3 also sends wind

speed and the speed of sound minus 340 m s

-1

via the SDM bus to the datalogger.

Option 97: “Get Wind and c-340 Data After a

Group Trigger”. The CSAT3, specified in

parameter 3, sends wind speed and the speed

of sound minus 340 m s

-1

to the datalogger. A

new measurement is not triggered. The SDM-

CSAT3 (P107) Instruction must be preceded by

the Group Trigger (P110) Instruction to use this

option.

Option 98: “Get Wind and Ts Data After a

Group Trigger”. The CSAT3, specified in

parameter 3, sends the wind speed and sonic

virtual temperature (defined in Equation (9) in

Appendix C) to the datalogger. A new

measurement is not triggered. The SDM-

CSAT3 (P107) Instruction must be preceded by

the Group Trigger (P110) Instruction to use this

option.

Option 99: “Get Wind and c Data After a

Group Trigger”. The CSAT3, specified in

parameter 3, sends the wind speed and speed

of sound to the datalogger. A new

measurement is not triggered. The SDM-

CSAT3 (P107) Instruction must be preceded by

the Group Trigger (P110) Instruction.

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