Campbell CS475 Manuale Utente Scaricare il pdf (Pagina 31)

User Manual

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

Section 8.1.4, Cyclic Redundancy Check).

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

8.1.5, Get Units).

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

the body of water you are monitoring (see Section 8.1.6, Get Water

Conditions).

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

want (see Section 8.1.7, Get Power Operation Mode).

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

caused by noise (see Section 4.2, Step 2 — Do a False Echo Learn Command).

8.1.1 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.

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

always followed by the aD0! (Send Data) command (see Table 8-1). As a response

of the Send Data command, the following information will be returned.

• Stage—the water level as measured in metres or feet. This measurement is

calculated using the Water Stage Setting and the Units setting.

• Distance—the distance between the sensor and water surface. This value will

be reported in either metres or feet, depending on the Units setting.

• Diagnostic Values—an error code. For example, Code 0 = OK, Code 13 =

error E013 (see Section 8.2, Diagnostics and Repair).

Table 8-1. Example of Start Measurement Command

Initial Command Response

0M!

Where zero is the

sensor address.

00023<cr><If>

Where (from left to right),

0—sensor’s address;

002—the amount of time (in seconds) that you must

wait before sending the send data command;

3—the number of values that will be placed in the

buffer.

Subsequent

Command

Response

0D0!

Where the first zero is

the sensor address.

0+100.050+25.000+0<cr><If>

Where (from left to right),

0—sensor’s address;

100.050—the stage in metres or feet;

25.000—the distance in metres or feet;

0—error code.

NOTE

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