Campbell CS526 Manual descargar pdf (Pagina 13)

CS526 ISFET pH Probe

8.2.2.4 SplitStr Instruction

The SplitStr() instruction has the following syntax:

SplitStr(SplitResult,SearchString,FilterString,NumSplit,SplitOption)

SplitResult — an array in which the split string will be stored.

SearchString — the string on which this instruction will operate. This will

be the variable entered for the Dest parameter for the SerialIn

instruction (see above).

FilterString — enter “String” (this value will be ignored because of the

SplitOption that will be used).

NumSplit — enter 2

SplitOption — enter 0. This splits out numeric values.

8.2.3 Example Program

The following is a CR1000 program that measures the CS526. This program

assumes the CS526 is connected to COM1 (C1 / TX and C2 / RX) on the

CR1000.

'CR1000 Series Datalogger

'Declare variable for PH measurement in mV

Public pHCount

'Declare variables for serial input from sensor

Dim rawstring As String * 20, pHDigit(2)

'Main Program

BeginProg

'Set up one of the datalogger's ports for serial communication

SerialOpen ( Com1,2400,16,0,41)

'Establish program scan rate of 60 seconds

Scan (60,Sec,0,0)

'Send get data command to CS526

SerialOut (Com1,"1M1!"&CHR(13),"",0,0)

'Set up CR1000 COM1 to receive incoming serial data.

'Set timeout to maximum 200 ms

SerialIn (rawstring,Com1,20,0,20)

'Split out numeric mV value for pH from string input

SplitStr (pHDigit(),rawstring,"String",2,0)

pHCount = pHDigit(2)

NextScan

EndProg

8.2.4 Programming for Calibration

To output in pH units instead of millivolts, enter the offset and multiplier into

the datalogger program. Simple program instructions can be used to make the

required periodic calibration easier. See Appendix A for an example program.

9. Calibration

Calibration should be carried out according to the detailed procedure outlined

in Appendix A. The calibration should utilize two or more pH standards, listed

in Table 9-1, which are available from Campbell Scientific.

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