Campbell CS475 Dokumentacja Pobierz pdf (Strona 20)

CS475, CS476, and CS477 Radar Water Level Sensor

7. Diagnostics, Repair, and Maintenance

7.1 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

7.1.1)

4. Send the Acknowledge Active command (see Section 7.1.2). 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 7.1.3).

6. Send the Start Verification command followed by the Get Data command

(see Section 7.1.4).

7. Use the Get Unit command to ensure the units are what you want (see

Section 7.1.5).

8. Use the Get Water Condition command to ensure that the water condition

fit the body of water you are monitoring (see Section 7.1.6).

9. Use the Get Power Operation mode to ensure that the power mode is what

you want (see Section 7.1.7).

10. Use the False Echo Learn command if you encounter a problem that could

be caused by noise (see Section 5.2.1).

7.1.1 Start Measurement Command

The 25616 Adjustment/Display Module or the terminal emulator

in LoggerNet or PC400 can be used to enter this command. The

Start Measurement command is also used in CRBasic or Edlog

programming. Refer to the Edlog help for the appropriate

command code entry.

NOTE

The aM! command requests measurement values from the sensor. This

command is always followed by the aD0! (Send Data) command (see Table

7-1). As a response of the Send Data command, the following information will

be returned.

• Stage--the water level as measured in meters or feet. This measurement is

calculated using the Water Stage Setting and the Units setting.

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Campbell CS475 Dokumentacja Strona 20