Campbell CS475 Specifiche Scaricare il pdf (Pagina 21)

CS475, CS476, and CS477 Radar Water Level Sensor

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

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

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

error E013 (see Section 7.2).

TABLE 7-1. 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 meters or feet;

25.000—the distance in meters or feet

0—error code

7.1.2 Check Unit Response

The Acknowledge Active command is used to check the presence of the sensor

on the bus (see Table 7-2).

TABLE 7-2. Acknowledge Active Command

Initial Command Response

a! a<cr><If!>

Only the address is sent back in response.

7.1.3 Check for Valid Data

The aI! command gets the following identification information in response to

sending al! (see Table 7-3).

• Compatibility level: Version of SDI-12 protocol version. For example, 1.3

• Manufacturer’s Name: VEGA

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Campbell CS475 Specifiche Pagina 21