Campbell CS475 Dokumentacja Pobierz pdf (Strona 15)

CS475, CS476, and CS477 Radar Water Level Sensor

radar sensor then emits the short microwave pulses. Any echo occurring 0.5 m

(1.6 ft) short of the distance you entered will be considered noise.

To start false echo learn, do the aXSFEL+nnn.nnn! command (where nnn.nnn

= the actual distance to the water) followed by the aD0! (Send Data) command.

Table 5-2 shows an example of the command and response.

TABLE 5-2. Example of a Start False Echo Learn Command

Initial Command Response

0XSFEL+2.500!

Where (from left to right),

0—sensor’s address;

2.500—the water surface distance.

02001<cr><If>

Where (from left to right),

0—sensor’s address;

200—the amount of time (in seconds)

that you must wait before sending the

send data command;

1—the number of values that will be

placed in the buffer.

Subsequent Command Response

0D0!

Where the first zero is the sensor

address.

This is the send data command.

0+2.500<cr><lf>

Where (from left to right),

0—sensor’s address;

2.500—the water surface distance.

5.2.2 Set Water Stage

The settings are changed using the 25616 Adjustment/Display

Module or the terminal emulator in LoggerNet or PC400.

During normal communication, the datalogger sends the address,

together with a command, to the sensor. The sensor then replies

with a “response”.

NOTE

With the Set Water Stage command, you enter the initial depth of the water,

and the sensor will automatically measure the distance between the sensor and

the water surface. The water stage setting and the initial distance measurement

are used to calculate subsequent water stage measurements. Correct stage

measurements require that the water stage setting be in the same units as the

Units of Measure setting. You can find out if the sensor is set to meters or feet

by using the aXGU! (Get Unit) command.

To set the water stage, do an aXSS+nnn.nnn! command (where nnn.nnn = the

initial water depth) followed by the aD0! (send data) command. Table 5-3

shows an example of the command and response for entering this setting.

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