Campbell CS526 Specifiche Scaricare il pdf (Pagina 17)

User Manual

Table 7-2. “Get Data” Command and Response

Command Response

aMn!<CR>

Where:

a = probe address (factory

default is 1)

n = a single dummy character

(typically use 1)

a<value><CR><LF>

Where:

a = probe address (factory default is 1)

<value> = the probe’s reading for pH

(in digital counts).

7.2.2 CRBasic Instruction Sequence

A sequence of CRBasic instructions is used to measure the sensor. Table 7-3

shows the instruction sequence. Information about the instructions is provided in

Section 7.2.3, Instruction Descriptions, and an example program is provided in

Appendix B, Example Program.

Table 7-3. Instruction Sequence

Instruction Function

SerialOpen()

Set up a datalogger port for serial communication (see Section

7.2.3.1, SerialOpen() Instruction)

Scan()

Establish a scan rate

SerialOut()

Send “get data” command to the CS526.

See Section 7.2.1, Get Data Command, and 7.2.3.2,

SerialOut() Instruction, for more information.

SerialIn()

Set up the COM port to receive the incoming serial data (see

Section 7.2.3.3, SerialIn() Instruction).

Please note that in the beginning of the CRBasic program, the

variable used in the SerialIn() instruction needs to be

declared as an ASCII string format.

SplitStr()

Split out digital count value for pH from the input string.

Probe output is “Counts”. A corrected multiplier and offset are

required to provide an output in pH units (see Appendix C,

Calibration).

7.2.3 Instruction Descriptions

7.2.3.1 SerialOpen() Instruction

The SerialOpen() instruction has the following syntax:

SerialOpen(ComPort,BaudRate,Format,TXDelay,BufferSize)

ComPort — the datalogger COM port in which the probe is connected.

BaudRate — choose 2400

Format — choose 16, which is TTL Logic; No parity, one stop bit, 8 data

bits; No error checking

TXDelay — enter 0

BufferSize — enter at least twice the number of maximum expected

characters + 1, which is 41.

NOTE

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 29 30

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Campbell CS526 Specifiche Pagina 17

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