Campbell CS475 Bedienungsanleitung PDF herunterladen (Seite 30)

CS475, CS476, and CS477 Radar Water Level Sensor

7.5.2.1 Example Program

Below is a portion of a CR10X program that measures the radar sensor.

The instructions below do not store data in final storage. Instruction

92, Instruction 77 and processing instructions such as Instruction 70

are required to store the data permanently.

;{CR10X}

;

*Table 1 Program

01: 60 Execution Interval (seconds)

1: SDI-12 Recorder (P105)

1: 0 SDI-12 Address

2: 0 Start Measurement (aM0!)

3: 1 Port ;this is where the white wire is connected

4: 1 Loc[Data_1 ]

5: 1.0 Mult

6: 0.0 Offset

*Table 2 Program

02: 0.000 Execution Interval (seconds)

*Table 3 Subroutines

End Program

After Instruction 105 is executed, the input location called “Data_1” will hold the

measured stage, reported in feet or metres (depending on the Unit of Measure

setting). The input location called Data_2 will hold the distance measurement,

reported in feet or metres (depending on the Unit of Measure setting). The input

location called Data_3 will hold the error code; an error code of 0 indicates that the

sensor is functioning properly (see Section 8, Diagnostics, Repair, and

Maintenance).

Note that Port 1 specifies that the SDI-12 data line is to be connected to the Port C1.

8. Diagnostics, Repair, and Maintenance

8.1 Testing Procedure

The test procedures for the sensor require the following steps:

1. Double check all wiring connections.

2. Connect the sensor to your datalogger and apply +12V power.

3. Compare the Output Stage versus the Actual Stage using the Start

Measurement command followed by the Send Data command (see Section

8.1.1, Start Measurement Command).

4. Send the Acknowledge Active command (see Section 8.1.2, Check Unit

Response). This command is used to check the presence of the sensor on the

bus. Only the address is sent back in response.

5. Send the Identification command (see Section 8.1.3, Check for Valid Data).

NOTE

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Campbell CS475 Bedienungsanleitung Seite 30