Campbell AVW200 series Manuel d'instructions télécharger pdf (Page 52)

AVW200-series 2-Channel Vibrating Wire Spectrum Analyzer Modules

detected. Therefore, the result variable for the first instruction would be zero

(indicating successful communication) and the result variable for the second

instruction would increment (indicating a failed communication). In the

pipeline mode this situation does not exist, so the result code variables can be

the same for multiple AVW200( ) instructions on a given communication port.

(1) When running in the sequential mode, programs that contain

multiple AVW200 instructions using the same COM port should

have different “Result” variables for each AVW200 instruction

(e.g. “Result1” and “Result2”) in order to detect and isolate any

communications errors for a given AVW200.

(2) If the AVW200( ) instruction is in a slowsequence, the mode

of operation is always forced to sequential mode.

Read more! Example programs of the sequential mode are provided in

Section 7.4.

6.2 SDI-12 Measurements

For our CR5000, CR10X, and CR23X dataloggers, an SDI-12 instruction must

be used to trigger and retrieve measurements from the AVW200. Our CRBasic

dataloggers (e.g., CR5000, CR1000, CR3000) use the SDI12Recorder

instruction, and Edlog dataloggers (i.e., CR10X, CR23X) use Instruction 105.

The SDI12Recorder instruction should only be run in the sequential mode.

When using SDI-12, multiplexers must be controlled by the datalogger.

Appendix G, CR10X Programming Example

(p. G-1), describes Instruction 105

and provides a CR10X program example.

6.2.1 SDI12 Recorder() Instruction

The values returned from the SDI12Recorder( ) instruction are different

depending on the SDI12 measurement command issued. The SDI12Recorder

instruction sends the command specified by the SDI12Command parameter as

(address)SDI12Command!. The AVW200 always returns six values.

Sytnax

SDI12Recorder ( Dest, SDIPort, SDIAddress, "SDICommand", Multiplier,

Offset )

The SDI12Recorder instruction has the following parameters:

Dest The Dest parameter is a variable in which to store the results

of the measurement. Dest must have enough elements to

store all the data that is returned by the SDI-12 sensor or a

'variable out of range' error will result during the execution

of the instruction.

NOTES

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Campbell AVW200 series Manuel d'instructions Page 52