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CS475, CS476, and CS477 Radar Water Level Sensor

The values returned from the SDI12Recorder() instruction are different depending

on the SDI-12 measurement command issued. The SDI12Recorder() instruction

sends the command specified by the SDI12Command parameter as

(address)SDI12Command!.

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 sensor or a ‘variable out of range’

error will result during the execution of the instruction.

SDIPort The SDIPort parameter is the port to which the SDI-12 sensor is

connected. A numeric value is entered:

Code

Description

1 Control Port 1

3 Control Port 3

5 Control Port 5

7 Control Port 7

SDIAddress The SDIAddress parameter is the address of the sensor that will

be affected by this instruction. Valid addresses are 0 through 9,

A through Z, and a through z. Alphabetical characters should be

enclosed in quotes (for example, “0”).

SDICommand The SDICommand parameter is used to specify the command

strings that will be sent to the sensor. The command should be

enclosed in quotes. Table 7-2 shows the specific SDI-12

Command Codes and their returned values.

Table 7-2. SDI-12 Command Codes

SDI12 Measurement Command Returned Values

1) Stage in metres or feet

2) Distance in metres or feet

3) Error Code (see Section 8,

Diagnostics, Repair, and

Maintenance)

7.5.1.1 Example Program

'CR1000 Series Datalogger

'Declare the variable for the water level measurement

Public CS475(3)

'Rename the variable names

Alias CS475(1)=Stage

Alias CS475(2)=Distance

Alias CS475(3)=Error_Code

'Define a data table for 60 minute maximum and minimums

DataTable (Hourly,True,-1)

DataInterval(0,60,Min,10)

Maximum(1,Distance,FP2,0,0)

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 47 48

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